Our Team


Our principals – Timothy Goetz, Robert Geiger and Jack O’Donoghue – possess more than 90 years combined experience in commercial real estate services. Since its first year, GSA has been committed to delivering the highest level of service possible through teamwork and the utmost integrity and professionalism.

Timothy R. Goetz


Robert N. Geiger


Brokerage Team

Randall G. McCombs, SIOR

Executive Vice President

John M. Lisowski

Vice President | Industrial Brokerage & Leasing

Gary F. Roberson

Vice President | Brokerage & Leasing

Samuel T. McGill

Senior Vice President | Tenant Representation

John S. Jackson

Senior Vice President | Retail Brokerage & Leasing

Evan Cicirello

Vice President

Todd Cwynar

Executive Director of Agency Leasing

Darin Shriver

Vice President

Support Staff

Diane McQuade

Director of Marketing Design

Ashley Koltonski

Director of Communications

Justin Brown

Director of Research

Leona Hodson

Administrative Assistant