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.

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Civil Engineering

Extensive expertise

We service all aspects of civil engineering including stormwater management, erosion control plans, floodplain studies and highway occupancy permits.

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Land 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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Diehm & Sons

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.

Timothy D. Diehm, P.L.S.
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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


Michael R. Kotay, P.L.S.

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


Kevin Varner, P.E.

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


Eric Keiser
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Eric Keiser
Director of Technology

Joined Diehm & Sons in 1999

Areas of Specialty:  
Boundary and/or topographic surveys including, but not limited to farms, schools, homeowners, commercial and industrial; Technology including network, infrastructure, workstation, AutoCAD, and many other aspects

Education:
BA – Anthropology
State University of New York - Stony Brook

Community Involvement:  
Board Member, Marietta Community House
Board Member, Marietta Restoration Associates
Volunteer, American Red Cross
Chairman, Marietta Borough Planning Commision


Ted Cromleigh

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


Tom Mattesonlinkedin 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


David MeaseLinkedin David A. Mease, P.E., S.E.O.
Project Manager

Joined Diehm & Sons in 2013

Areas of Specialty:
Project Management, Site Design, Zoning

Education:
BS degree – Environmental Resource Management
Pennsylvania State University

Community Involvement:
-

Associations: 
-


Jennifer Gerhart Jennifer B. Gerhart
Office Manager

Joined Diehm & Sons in 2011

Areas of Specialty:
-

Education:
BS degree – Elementary - Special Education
Millersville University

Community Involvement:
-

Associations: 
-


Doug Herr 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


Kevin Sapp 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