Founder Profile
Samuel P. Geisberg
Last reviewed: October 2026 · By Swet Parvadiya
Who is Samuel P. Geisberg?
Samuel P. Geisberg is a founder of PTC Inc., which was founded in 1985 with Mike Payne.
- Company founded
- PTC Inc.
- Founded
- 1985
- Co-founders
- Mike Payne
Background
Mathematician who emigrated from the Soviet Union in the 1970s and worked on CAD software at Applicon and Computervision before founding PTC.
Founding Story
Samuel P. Geisberg founded Parametric Technology Corporation in 1985 after concluding that existing CAD systems could not easily update designs when requirements changed. His parametric, feature-based approach, delivered as Pro/ENGINEER in 1988, let a single dimension change ripple through a part, its assembly and drawings. Pro/ENGINEER helped PTC win large accounts such as Caterpillar in the early 1990s, and the same modeling approach was later adopted across the CAD industry, including by SOLIDWORKS and Autodesk Inventor. (Exact birth year remains publicly undisclosed).
Sources
This profile does not yet cite a source specific to Samuel P. Geisberg. The sources below document the company company rather than the person, so check them against the claims above.
- PTC FY2025 Form 10-K (PTC Inc.)
- PTC FY2025 Annual Report PDF (PTC Inc.)