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Meet the Authors
Check out our fine lineup of writers. Each an expert in his or her field.

Daniel E. Beardslee, LS
Dan Beardslee has been an employee, a partner, and an owner of private land surveying practices, spanning 31 years. He obtained his Washington State survey license in 1975, and is an expert in Washington State boundary issues, well versed in land-use matters, and is widely regarded as a leader in the implementation of GIS for surveying firms. He is the author of numerous publications including, Land Surveying for the Land Owner and Real Estate Professional, and Management Handbook for Land Surveyors, and he is co-author of many publications including Beyond the Traverse Point (a text on land surveying practice), Receivables Management for the Practicing Professional and Washington Boundary Law and Adjoining Landowner Disputes. His articles have appeared in Professional Surveyor, POB, and in journals in Canada and New Zealand. Beardslee received a Bachelor of Arts Degree in Business Administration (Economics) from Washington State University, has done post graduate work in economics at Skagit Valley College, City University, Wenatchee Valley College, and Western Washington University. He has taught and lectured across the United States on Land Surveying management. Beardslee was awarded the NSPS Survey Project of the Year award in 1983, and has received several Awards of Merit by the LSAW. He is a Past President of the Land Surveyors Association of Washington (LSAW), Past Governor of the National Society of Professional Surveyors (NSPS), and Past Chair of the NSPS Business Practices Committee. He currently holds membership in LSAW, NSPS, the American Congress on Surveying and Mapping (ACSM), and the Western Federation of Professional Land Surveyors (WFPLS), and is a member of the Survey Advisory Board of the Washington State Department of Resources.
Silvio A. Bedini
Silvio Bedini is a Historian Emeritus of the Smithsonian Institution where he served on the professional staff for twent-five years. Retired since 1987, he actively continues to research and publish history-related books and articles. Bedini was born in the Colonial town of Ridgefield, Connecticut in 1917. After local schooling he matriculated at Columbia University, where his studies were interrupted by World War II. Volunteering for the U.S. Army Air Corps, he was subsequently transferred from Chicopee Falls Air Field to G-2 in Washington, D.C. He served three-and-a-half years and was honorably discharged as the War ended. Returning to Connecticut, he engaged in a family business for a few years, wrote for children's magazines and true science comics, and did research for publishers of encyclopedias. In 1958 he accepted an invitation to write a brochure about the history of his hometown for its 250th anniversary, a project that just three months later resulted in a 411-page book titled Ridgefield in Review. In 1961 he accepted the offer of a position in Washington, D.C. as curator at the Smithsonian Institution in the new Museum of History and Technology (now the National Museum of American History), which was under construction. He recalls the swell of emotion that brought tears to his eyes as he walked toward the red-bricked Smithsonian “Castle” for his first day on the job, a place where he felt “at home” from the start. Over the next several years he was promoted from curator and Division Supervisor to Assistant Director and eventually Deputy Director of the museum. In addition to his position in administration, his subject field was antique scientific instruments. Subsequently he was offered a newly established position of Keeper of the Rare Books of the Smithsonian Institution, and succeeded in acquiring important collections of rare books in science and technology for its libraries. Bedini’s association with land surveyors began quite accidentally about twenty years ago when a new surveying trade journal was about to go to press and the editor needed an article on surveying history. At the last minute he was called upon to write it, a tradition he continued in almost every issue for the next two decades. For the most part, early American surveyors and instrument makers were among “the little men of science,” mostly forgotten and overlooked by scholarly historians, yet whose lives aroused in Bedini considerable interest. To recover the story of a surveyor's career almost always involves considerable research—for maps, surveying records, and vital statistics—in state, county and city archives as well as local histories, church records, and local cemeteries. His intensive research on various aspects of the history of science eventually led to the writing of more than 300 articles and monographs published in scholarly periodicals, and 22 books published in the United States and Europe. For his research and publications in 1962 Bedini received the Abbott Payson Award of the Society of the History of Technology, and in 1997 in Darmstadt, Germany he was awarded the Paul-Bunge-Preis at the General Assembly of the German Bunsen Society for Physical Chemistry "for the book of foremost quality on the history of scientific instruments." Three years later, in 2000, in Munich, Germany he was awarded the Leonardo da Vinci Medal, "the highest recognition from the Society of the History of Technology." His memberships include the American Philosophical Society, the American Antiquarian Society, the Society of American Historians, the Washington Academy of Sciences, the Scientific Instrument Society (London), the Astrolabe Society (Paris), the Surveyors Historical Society, and most recently, the DC Association of Land Surveyors, which extended to him an Honorary Membership in December 2003. Bedini is presently completing his twenty-third book.
Joe Bell, LS
Joseph Huxley Bell, III was born in El Paso, Texas in 1933 and raised in Alexandria, Virginia. He obtained a BA in English Literature from George Washington University in 1956 and an MD from the University of Virginia in 1960. He interned at Walter Reed General Hospital, served three years at Fort Riley, Kansas, and completed a one-year residency at Creighton University in Omaha, Nebraska. He practiced medicine in Southern California until 1976. Bell developed a love of hiking and mountain climbing, having served for five years on a mountain search and rescue team. He also spent several years technical rock climbing. He continued his education by returning to school to study computer science. During that time he went to work as a chainman for the City of San Bernardino and fell in love with the profession of surveying. For three years he published The Survey Calculations Journal. He obtained his survey license in California in 1981, was employed as a deputy county surveyor for the County of San Bernardino. In 1991 he accepted an 18-month contract in Egypt where he worked in the adjustment of field work. He was then given the responsibility of creating a computer-based Land Information System for all of Egypt. Upon returning to the U.S., Bell worked in private industry, for the New Mexico Highway and Transportation Department, and in his own GPS-based company until his retirement. He has been a reviewer of software since 1982, and continues to do so in his retirement. Bell currently lives and writes in New Mexico with his wife, Felicity, and his son, Mitch. He is a chamber music enthusiast, first violin of the Rio Bravo String Quartet, and concert master of the New Horizons Orchestra.
J. Anthony (Tony) Cavell, PLS
Tony Cavell was born and reared in Lafayette, Louisiana. His first pursuit was Physics. He worked for several years in the Physics Department and the Petroleum Engineering Department at Louisiana State University, followed by a stint in the construction field during which time his curiosity was piqued about surveying. His surveying experience began in New Orleans, followed by the opportunity to survey offshore back in Lafayette. This was a fortuitous opportunity, during which he experienced the changes of technology from conventional optical equipment through microwave and acoustic positioning to the age of satellite positioning.
Cavell joined Navigation Electronics, Inc (NEI) as Vice President in 1993, and served as CEO from 2000-2002. He was a member of the original class of Trimble Certified Trainers and enjoyed giving seminars and presentations across the country and as far afield as Saudi Arabia. Cavell is a surveying consultant. He managed ESP Associates’ QA for FEMA’s LiDAR surveys of Louisiana and GPS and LASER scanning surveys for SAM, Inc. in Texas.
He is an active member of Louisiana Society of Professional Surveyors (LSPS), which he served as president from 2002-2003. He is a LAPELS Board-approved Sponsor/Provider of CPD activities, and enjoys writing as time permits. Today he is Associate Director of the Louisiana State University Center for GeoInformatics and Louisiana Spatial Reference Center.
Paul A. Cuomo, L.S.
Paul began his surveying career in 1958 as an Engineering Aid for the California Division of Highways (Cal-Trans). He became a Licensed Land Surveyor in 1973 and, in that year, joined the staff at Rancho Santiago Community College in Santa Ana, California. He taught Boundary Control, Description Writing and U.S. Public Lands for over 25 years. Paul is also a guest lecturer at Cal- Poly Pomona .He left the Cal Trans in 1980 and took a position at the Orange County Surveyor’s Office as Deputy County Surveyor. He held that position until his retirement in January, 1993.
Paul founded Pacific Land Seminars, an intellectual corporation, in 1985. He has given seminars on L.S. Exam test preparation, Boundary Control, Description Writing, the U.S.P.L.S.S., A.L.T.A. Surveys , Condominium Plans, the State Plane Coordinate System and Surveying Principles for the Civil Engineering exam. Paul served as State President of the California Land Surveyor’s Association in 1989. He is currently Chairman of the Southern California Section of A.C.S.M. and Chairman of the California Foundation for Land Surveying Education. In 1993 he co-authored the nationally acclaimed book “Advanced Land Descriptions” with the late Roy Minnick and Michael Pallamary Paul is also the author of :Surveying Principles for the Civil Engineer” ( P.P.I. ) On April 1, 2003 Paul acquired Landmark Enterprises from the late Roy Minnick. Re-named “Paul Cuomo Press, Inc.” it is the largest on-line book distributor in the U.S. and can be found at
James J. Demma, LS, Esq.
Jim Demma is a licensed surveyor and has practiced law in Maryland for more that 30 years. His extensive experience has included land use & development, titles, land patents, boundary disputes and more. He has supervised and conducted more than 7,000 real estate settlements in Maryland, Virginia, and Washington, D.C. He received a Bachelor of Arts from the University of Maryland in 1967, and obtained his Juris Doctorate from the same institution in 1972. His Bar Admissions/Court Admissions include Maryland, the District of Columbia, and the U.S. Supreme Court. Demma is a member of the Maryland State Bar Association, and the Montgomery County Bar Association (of which is he a former chairman of the Real Estate Section). He is also a consultant to the Maryland State Board of Registration for Professional Land Surveyors, and is a member of the Maryland Society of Surveyors (MSS). He was named “Maryland Surveyor of the Year” in 1982. He has lectured, taught, and written widely on the subject of land surveying and the law, with articles appearing in Professional Surveyor Magazine, as well as in publications by the American Congress on Surveying and Mapping (ACSM).
Dr. Richard Elgin, LS, PE
Dick Elgin, a second-generation surveyor, was raised in his father's surveying business in Rolla, Missouri. After serving meritoriously as an Army helicopter pilot in Vietnam he returned to Rolla and received a BS and an MS degree in civil engineering from the University of Missouri-Rolla (UMR). After working for a consulting engineer in the Kansas City area for several years, he attended the University of Arkansas and received the degree Doctor of Philosophy. Leaving Arkansas, he joined the faculty of the Department of Civil Engineering, University of Missouri-Rolla (UMR) as an Assistant Professor (1980-1984). Since 1984 he has served as owner and president of Elgin Surveying & Engineering, Inc., Rolla, Missouri and as Adjunct Professor of Surveying at UMR. He also is a principal in the firm of Elgin, Knowles & Senne, Inc. Dr. Elgin is a past president of the Missouri Association of Registered Land Surveyors (now MSPS). He is the coauthor of two books: Legal Principles of Boundary Location for Arkansas, and the Sokkia Celestial Observation Handbook and Ephemeris, and is a contributor to The Surveying Handbook. He is a past member of the Missouri Board for Architects, Professional Engineers, Professional Land Surveyors and Landscape Architects and still serves as a consultant to that Board. He is a licensed professional surveyor in Missouri, Arkansas and Kansas, and a licensed professional engineer in Missouri, Arkansas and Kansas, and belongs to numerous professional and civic organizations. Elgin regularly presents seminars on operating a surveying business.
Fred Henstridge, LS
Fred Henstridge has more than 50 years of professional experience in geomatics engineering, surveying, mapping, transportation engineering, municipal engineering, and GIS management. He spent ten years with the California Department of Transportation where he was involved with planning, engineering, and surveying efforts with the Caltrans interstate highway program. After his tenure with Caltrans, he started his own geomatics and civil engineering firm, which was acquired by Psomas and Associates in 1982. Since that time, he has been a Principal of Psomas, Corporate Director of Geospatial Services and GIS. He is currently Director of Psomas’ Federal Programs Development.
Gary Kent, LS
Gary Kent is Director of Surveying at The Schneider Corporation, a 42-year-old consulting firm based in Indianapolis providing solutions in surveying, GIS, 3D graphics, architecture, and civil, municipal and transportation engineering. A past-president of both ACSM and the Indiana Society of Professional Land Surveyors, Gary has a BS degree in Land Surveying from Purdue University and is registered to practice surveying in Indiana and Michigan. He is chair of both the NSPS/ACSM committee and the ALTA committee on the ALTA/ACSM Standards. He currently sits on the Indiana State Board of Registration for Land Surveyors and is also a member of the adjunct faculty at the Purdue campus in Indianapolis where he teaches Land Survey Systems, Legal Descriptions, Boundary Law and Property Surveying.
Wendy Lathrop, LS
Wendy Lathrop is licensed as a Professional Land Surveyor in New Jersey, Pennsylvania, Delaware and Maryland, and as a Professional Planner in New Jersey. She holds a Master's degree in Environmental Policy, and has been involved since 1974 in surveying projects ranging from construction to boundary to environmental land use disputes. Wendy has taught courses at Mercer County College (New Jersey), Penn State University, and Drexel University, and also speaks across the US on surveying topics ranging from boundary to business to technical issues. She has been writing articles for surveyors since 1983. Wendy represented the American Congress on Surveying and Mapping the Technical Mapping Advisory Council to the Federal Emergency Management Agency for the full five years of that advisory group's appointment, from 1995 through 2000. She was a panel member of the National Academy of Public Administration's study of US Geographic Information resources from December 1996 through September 1997, culminating in a NAPA-produced report entitled "Geographic Information for the 21st Century: Building a Strategy for the Nation". Wendy is a past President of the New Jersey Society of Professional Land Surveyors and of the National Society of Professional Surveyors.
Joel M. Leininger, LS
Joel Leininger, Associate Editor of the magazine, is the managing partner of S. J. Martenet & Co., a 154-year-old surveying firm in Baltimore, Maryland. He lectures frequently around the country on surveying-related subjects. Leininger has authored more than thirty articles and essays dealing with surveying and retracement, some of which have been published in Canada and Australia. Prior to his work at S.J. Martenet, he served as department head at Fisher, Collins and Carter, and as project manager with Daft-McCune-Walker, both in Baltimore. Leininger has also served as both Contributing Editor and Associate Editor of Professional Surveyor Magazine. He served five years on the Maryland Board of Registration and is a past-president of the Maryland Society of Surveyors.
Jeff Lock
Jeff Lock draws on 30 years of experience in the restoration field to focus on colonial instruments from the 18th century and the techniques that were used for their construction. His continuing research has uncovered unusual instruments that will be discussed in detail in his forthcoming articles. He is currently working on a book titled The Art of Early Colonial Surveying Instruments.
Daniel J. Martin
Dan Martin is a Physical Scientist with the National Geodetic Survey and is the NGS Geodetic Advisor for the State of Vermont. He holds an Associates Degree in Civil Engineering Technology from Vermont Technical College. From 1987-2003 he held various positions with the Vermont Agency of Transportation, beginning as Assistant Resident Engineer in 1987, and working as the Geodetic Program Supervisor from 1998-2003. In 1992 he was on Special assignment to National Geodetic Survey field office during Northeast High Accuracy Reference Network campaign. His professional associations include the American Congress on Surveying and Mapping (ACSM), American Association for Geodetic Surveying (AAGS), Vermont Society of Land Surveyors (VSLS), Civil GPS Service Interface Committee. He is Chair of GIS/LIS and the Vermont Geodetic Network Committees and a member of Continuously Operating Reference Station (CORS) Committee. He received Meritorious Service Awards from the Vermont Agency of Transportation in 1997, 2001, and 2002, and their Employee of the Year Awards in 1998 and 2001. In 2002 he received a National Geodetic Survey Partner Award. Martin was the author of the “GPS Basics” column in Professional Surveyor. He has written for the Vermont newsletter Cornerpost, and has published a number of papers for ACSM publications.
John D. Matonich, LS
John Matonich is the President and Chief Executive Officer of Rowe Incorporated, a firm specializing in professional engineering, surveying, planning, landscape architecture and aerial photogrammetry in Michigan and across the country. John has worked with Rowe Incorporated since 1981, became a principal in 1992, was promoted to president in 1997, and chief executive officer in 2001. John is licensed as a Professional Surveyor in both Michigan and Ohio. He is a Past State President of Michigan Society of Professional Surveyors (MSPS) headquartered in Lansing and has chaired several statewide committees. He currently serves as Chairman of the Michigan Qualification Based Selection Coalition, the MSPS Legislative Committee, and the MSPS Past Presidents Committee. John is a member of the Surveying Curriculum Advisory Committee at both Michigan Technological University and Ferris State University. He has also served as adjunct faculty to the University of Michigan Earth Sciences Department Riverfront Campus. John is very active nationally, and currently serves as Chairman of the Joint Government Affairs Committee for the American Congress on Surveying and Mapping (ACSM), headquartered in Washington, D.C., as well as Chairman of the Bylaws and Resolutions Committee of the National Society of Professional Surveyors. He was recently elected as a Delegate to the ACSM Congress representing over 4500 members across the country. Locally, John is a member of the Flint Area Chamber of Commerce Board of Directors and the Past President of the Davison Chamber of Commerce. He is also a member of the Burton Rotary Club, Davison Optimists Club and is past chair of the Lapeer Downtown Development Authority. John obtained his Bachelor of Science degree in Land Surveying with honors from Michigan Technological University in 1981.
Jerry Penry, LS
Jerry Penry is employed by Lancaster County Engineering in Lincoln, Nebraska. He has been a licensed surveyor since 1994 specializing in section corner monumentation and GPS surveying. He has presented surveying seminars with a historical aspect combined with modern day application. His special interests in this field include extensively researching historically relevant information, making the original surveyors' work come alive. His meticulous research and thorough writing sheds light on the original surveyors' tools, conditions and limitations. He is also very knowledgeable in various other historical matters including railroad history. He has written numerous surveying articles for newsletters, magazines and journals, and has authored or co-authored several books including The Chicago and North Western Cowboy Line: A History of the Longest Rail-to-Trail Project in America, and The Sunrise Serenade: A World War II Bomber Crew Story.
Al Pepling, LS
Al Pepling works for Trans Associates in Pittsburgh. He is licensed as a professional land surveyor in Pennsylvania, as a professional planner in New Jersey, and is a past president of the New Jersey Society of Professional Land Surveyors (NJSPLS).
Walter G. Robillard, PLS, Esq.
Walt Robillard specializes in land boundary disputes and has served as a consultant in boundary and land title disputes, both locally and internationally, ancient and modern. He holds a BSF degree from the New York State College of Forestry at Syracuse University, an MA degree in Public Administration from the University of Oklahoma, a Juris Doctor degree and an LLM Master of Laws degree from Atlanta Law School. He is a member of the State Bar of Georgia, Attorney At Law, and is a registered professional surveyor in Georgia, Florida, North Carolina, South Carolina, and holds honorary memberships in the states of Arkansas, Arizona, Florida, Georgia, Idaho, Kansas, Nevada, Michigan, Iowa, Oklahoma, North Carolina, and Vermont. He is a member of numerous professional organizations, and has received numerous professional awards from across the country. Robillard’s vast experience, training and education as a forester, land surveyor and an attorney gives him a unique perspective when analyzing field methods and legal issues, and he still performs much of his own field research and field work. His writings of college text books and legal research books are accepted by both the surveying and the legal professions, and he is a popular speaker and presenter on the lecture and continuing educations circuits.
Gavin Schrock, LS
Gavin Schrock is a surveyor and GIS Analyst for Seattle Public Utilities, where he focuses on using digital data to improve the cost ratios for engineering projects. He has worked in surveying, mapping, and GIS for 23 years in the civil, utility, and mapping disciplines. He has published in these fields and has taught surveying, GIS, and data management at local, state, national, and international conferences.
Laurence Socci
Laurence Socci is Chief Executive Manager of The CLA Group, a government consulting, lobbying and advocacy firm in Washington, DC. He is also the government affairs consultant for the American Congress on Surveying and Mapping (ACSM).
Angus W. Stocking, LS
Angus Stocking, now registered in Wisconsin, has worked as a surveyor in California, Idaho, Kentucky, Mississippi, Louisiana, Indiana, Missouri and Texas for firms ranging in size from two employees to the California Department of Transportation. In addition to surveying, he has been a dealer for AutoCAD and other engineering software, owned a cleaning company, and written humor and non-fiction for newspapers and magazines on a puzzling variety of topics. He currently works as a survey manager at MSA Professional Services, Inc. in Beaver Dam, Wisconsin.
Patrick Toscano, LS
Pat Toscano is the City Surveyor for the City of New Britain, Connecticut. He has taught surveying classes since 1988, and is an adjunct faculty member at Central Connecticut State University in New Britain, and at Capital Community College in Hartford.
Rj Zimmer, LS
Rj Zimmer Zimmer is a professional land surveyor, registered in Oregon and Montana, with more than 25 years of experience in land surveying in the private and public sectors. He has more than 15 years of GIS experience managing and using GIS in local government. Zimmer currently serves as the GIS program manager for the Lewis & Clark County and City of Helena's Geographic Information Services Center in Montana. Zimmer chairs the Montana Geodetic Control Working Group, is past-chair of the Montana Local Government GIS Coalition, and represented local government on the Governor’s Montana Geographic Information Council. He is also a local government representative reviewer to the national Federal Geographic Data Committee (FGDC) geodetic control Data Content Standard development effort, and the Bureau of Land Management’s Geographic Coordinate Database (GCDB) accuracy upgrade plan development. Zimmer holds a BS degree in engineering-physics from Oregon State University. He has published more than 50 articles on GIS, and has taught numerous courses and workshops across the country. Zimmer provides consulting services for the GIS and mapping industries.