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Dan Petruc-Naum, P.E. and Patrick Crosby, S.E.

Formerly an independent branch of Alagia-Crosby Engineers out of Phoenix, Arizona, Crosby Group became an independent corporation headed by Patrick Crosby and Dan Petruc-Naum in 1992.

The firm was founded with the vision that innovation, creativity and responsiveness would complement the firm's ability to provide excellent engineering services.


Patrick Crosby, S.E., DBIA, LEED AP

Patrick Crosby, S.E.

Patrick Crosby serves as the visionary of the firm. He sets the direction of the company and acts as general marketing guru. Client and employee relationships are crucial to him. He maintains an open door policy and is in constant communications with clients to ensure our team meets or exceeds their expectations on every project.

Pat is an innovator and leader in the seismic design field. His niche in the company has always been his enthusiasm and knowledge of seismic technology. Pat has traveled the world chasing earthquakes. After major earthquakes such as Italy, Mexico, Turkey, Japan, and Taiwan he toured each of the sites to learn what technology failed, what technology was successful, and what new information the earthquake itself would tell us about structural design. We incorporated this knowledge and technology into our seismic retrofit designs, such as the historic Marin County Hall of Justice, a Frank Lloyd Wright Municipal Facility.

Pat was recently named to the Board of Directors of the Design Build Institute of America (DBIA) where he continues his advocacy and contributions to the design-build industry.

To receive an AIA-CES Approved (1 AIA/CES Learning Unit/HSW) Structural Technology presentation (Course: AIACESST101) from Patrick, visit our What's New section.



Dan Petruc-Naum, P.E.

Dan serves as Vice-President of Project Management and Design. He makes certain that projects are run properly to ensure high quality and to make the most of client's budgets.

His niche within our firm is his international experience. Originally from Romania, Dan speaks five languages and works with our international clients on projects in Saudi Arabia, China, Ukraine, Russia, Turkey, Hungary, Romania, and Mexico. He is able to blend his own experience with international codes and remote locations to design large scale projects.

Dan's 30+ years of experience and PhD in the study of earthquake protection and reinforced concrete make him a valuable resource for Crosby Group engineers.






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