Jahn is among the most iconic names in architecture. Founded more than 60 years ago, our studio has reshaped cities and changed minds. Today, that legacy is carried forward under the ownership of Deborah Jahn, with the firm now a certified Women’s Business Enterprise (WBE), and a collaborative studio culture led from Chicago by Evan Jahn, Assoc. AIA, WELL AP, LEED AP ND, Philip Castillo, FAIA, and Scott Seyer, AIA, LEED AP. Working alongside leading engineers, fabricators, and builders, the studio delivers architecture defined by integrity, performance, and timeless quality. By trusting creativity and allowing space for experimentation, we believe architecture can meaningfully improve how people live, work, and connect.
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Jahn/ Questions
The Jahn/ annual revenue was $12.5 million in 2026.
Evan Jahn is the President of Jahn/.
34 people are employed at Jahn/.
Jahn/ is based in Chicago, Illinois.
The NAICS codes for Jahn/ are [54, 54131, 5413, 541].
The SIC codes for Jahn/ are [8712, 871, 87].
Top Jahn/ Employees
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Evan Jahn
President at Jahn/
Chicago, IL, US25 -
Robert Danko
Chief Financial Officer at Jahn/
Chicago, IL, US15 -
Scott Seyer
Managing Director at Jahn/
Chicago, IL, US15 -
Arthur Herbstman
CFO at Jahn/
Chicago, IL, US14 -
Philip Castillo
Executive Vice President at Jahn/
Chicago, IL, US11 -
Steven Cook
Managing Director at Jahn/
Chicago, IL, US12 -
Joseph Stypka
Vice President, Director Specifications at Jahn/
Chicago, IL, US5 -
Lynda Dossey
Director at Jahn/
Chicago, IL, US35+ -
Stephen Kern
Principal Architect at Jahn/
Evanston, IL, US15+ -
John Ruffolo
Associate Principal Architect of Design at Jahn/
Chicago, IL, US21
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