Surveying & Mapping
Surveying since 1885
We focus our expertise on traditional surveying methods, as well as electronic measuring, photogrammetric mapping and other state-of-the-art methods.
learn moreCivil Engineering
Extensive expertise
We service all aspects of civil engineering including stormwater management, erosion control plans, floodplain studies and highway occupancy permits.
learn moreLand Planning
Turning your vision into reality
Whether it's subdivision plans, estate planning, sewage plans, or site feasibility analysis, we offer the guidance and experience that provides peace of mind.
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View our Portfolio to see a sampling of our projects.
Diehm & Sons Staff
At Diehm & Sons, we offer the personalized level of attention that you want and deserve, in addition to being fully licensed and insured as surveyors and civil engineers. We consider ourselves members of your team, seeking a successful outcome for your project. All professionals on staff hold an average of 15 years of experience in surveying or civil engineering.
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Timothy D. Diehm, P.L.S. President Joined Diehm & Sons in May 1980 (worked summers and school breaks since 1970) Areas of Specialty: All aspects of Business Management Licensed Professional Land Surveyor in Pennsylvania Owner / President since April 1, 1995 Education: Associates Degree in Engineering – Surveying Technology Penn State University Community Involvement: Member, Trinity Evangelical Congregational Church, Lititz, PA Associations: Pennsylvania Society of Land Surveyors Pennsylvania Association of Professional Land Surveyors Lancaster County Builders Association Lancaster Chamber of Commerce and Industry Penn State Alumni Association – Life Member |
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Michael R. Kotay, P.L.S. Director of Surveying Joined Diehm & Sons in 1978 Areas of Specialty: Boundary and/or topographic surveys including, but not limited to farms, schools, homeowners, commercial and industrial; Project Management Licensed Professional Land Surveyor in Pennsylvania since 1985 Director of Surveying since December 2010 Education: Associate Degree – Forest Technology Penn State University BS degree – Education Mansfield State College Community Involvement: Volunteer for many Social Agencies throughout Lebanon County Board Member and Habitat Coordinator - Woodcock Limited of Pennsylvania Member, Ruffed Grouse Society – South Mountain Chapter Member, Izaak Walton League – Red Rose Chapter |
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Kevin Varner, P.E. Director of Engineering Joined Diehm & Sons in 1997 Areas of Specialty: Storm Water Management, Floodplains, Erosion Control, Project Management Licensed Professional Engineer in Pennsylvania since 1999 Director of Engineering since December 2010 Education: BS degree – Civil Engineering Temple University Community Involvement: Member, Mount Joy Mennonite Church Associations: American Society of Civil Engineers |
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Eric Keiser Director of Technology Joined Diehm & Sons in 1999 Areas of Specialty: |
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Ted Cromleigh Project Manager Joined Diehm & Sons in 1987 Areas of Specialty: Boundary and/or topographic surveys including, but not limited to farms, schools, homeowners, commercial and industrial; Project Management; Sewage Planning including alternative methods of sewage disposal, and DEP permitting Community Involvement: Chairman, Heidelberg Township Planning Commission |
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Tom Matteson Project Manager Joined Diehm & Sons in 2006 Areas of Specialty: Project Management, Site Design, Zoning Education: Associate Degree – Specialized Technology National Education Center Community Involvement: Alternate Member, Warwick Township Zoning Hearing Board Member, Lancaster Evangelical Free Church Associations: Member, Izaak Walton League – Red Rose Chapter |
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Jeff Bowlby Surveyor Joined Diehm & Sons in 2004 Areas of Specialty: Boundary and/or topographic surveys including, but not limited to farms, schools, homeowners, commercial and industrial; Construction surveying (stake out); Project Management Education: Bachelor of Science – Mathematics James Madison University Community Involvement: Member, Dove Westgate Church Volunteer Coach, Warwick High School Wrestling |
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Douglas J. Herr, P.L.S. Surveyor Joined Diehm & Sons in 2003 Areas of Specialty: Boundary and/or topographic surveys including, but not limited to farms, schools, homeowners, commercial and industrial; Storm Water Management Education: Associate Degree – Applied Science in Surveying Technology Pa. College of Technology |
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James Ober Surveyor Joined Diehm & Sons in 1975 Areas of Specialty: Boundary and/or topographic surveys including, but not limited to farms, schools, homeowners, commercial and industrial, Project Management |
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Kevin Sapp Surveyor Joined Diehm & Sons in 1992 Areas of Specialty: Boundary and/or topographic surveys including, but not limited to farms, schools, homeowners, commercial and industrial; Construction surveying (stake out); PennDOT permitting Education: Associate Degree – Surveying Penn State University Community Involvement: Member, St. James Catholic Church |