About Us

Gauge Engineering (Gauge) is a full-service, certified small business, Houston-based engineering firm that specializes in providing engineering planning, design and construction management services to our public sector clients. Our core services include transportation and water resources. Gauge was co-founded by Derek St. John, PE, CFM, and Muhammad Ali, PE, ENV SP, both with a proven track record of successfully delivering challenging infrastructure projects for public agencies throughout the state of Texas.

Derek and Muhammad

The Gauge team is comprised of more than thirty engineers, planners, and design technicians fully capable of leading and delivering complex assignments and initiatives.The strength of the team is a combination of their keen attention to detail and long-standing client relationships founded on trust and mutual respect. This unique personal connection with clients has led to well-established professional and personal relationships.

Our People


Derek St. John, PE, CFM Gauge Engineering

Derek St. John, PE, CFM, is a Principal and Founding Partner of Gauge Engineering.


Muhammad Ali, PE Gauge Engineering

Muhammad Ali, PE, LGPP, is a Principal and Founding Partner of Gauge Engineering.


Terry M. Barr, PE, CFM Gauge Engineering


Brian Whitney, PE, CFM Gauge Engineering


Patrick Phillips, PE, CFM Gauge Engineering


Ian Hudson, PE Gauge Engineering


Karam Qaddo, PE Gauge Engineering


David Greaney, PE, CFM Gauge Engineering


Heather Goodpasture, PE, CFM Gauge Engineering