Chief Executive, Partner Engineering and Science Inc.

The Torrance-based Partner Engineering and Science Inc. was featured
on Inc.’s 5000 Fastest-Growing Private Companies last year, its
seventh appearance on the list. According to Inc., only four companies
have made the list seven times in the 40 years of the Inc. 5000. Derhake
launched Partner Engineering and Science in 2007 with eight
employees. The company provides engineering and environmental
services, including subsurface investigations and site remediation as
well as energy consulting and design services for development projects.
Derhake holds an MBA from USC and a BS in civil engineering
from Michigan State.

YEARS ON THE LA500: 6