About DGA

Forensic architects offer specialized services tailored to investigating and analyzing architectural and construction-related matters, frequently within legal or dispute resolution frameworks. Their expertise encompasses the application of architectural insights, engineering principles, and investigative methods to discern the root causes of failures, accidents, or disputes concerning buildings and structures.


For over 25 years, Diehl Group Architects has been synonymous with unwavering integrity, consistently upholding the highest standards of morality and professionalism in all facets of our endeavors. Our dedication to excellence compels us to consistently deliver nothing but the finest outcomes for our clients. Founded on principles of trust, transparency, and ethical conduct, we are driven to surpass expectations while prioritizing the needs and aspirations of our valued clients.

Staff Profiles

Bradley Hammerstrom:

Principal Architect / President

Bradley has almost 30 years of experience in the world of Forensic Architecture. He received his Bachelor of Architecture Degree from California Polytechnic State University (CalPoly), San Luis Obispo in 1990 and has been a licensed architect since 2001.

Michael Poage:

Project Manager / Vice President

Michael has almost 10 years of experience in the world of Forensic Architecture. He received his Bachelor of Science – Mechanical Engineering Degree from the University of California, Riverside in 2010 and his Master of Architecture Degree from NewSchool of Architecture and Design, San Diego in 2013.

Sean Hoxie:

Architectural / Waterproofing Consultant

Sean has almost 30 years of experience in the world of Forensic Architecture. He received his Bachelor of Science Degree from Miami University of Ohio, School of Applied Sciences in 1986 and has been a licensed architect since 1995.

Jason LaRocca:

Technical Assistant

Jason has almost 3 years of experience in the world of Forensic Architecture. He received his Bachelor of Architecture Degree from NewSchool of Architecture and Design, San Diego in 2016.

John (Jack) Diehl:

Founder / Architectural Consultant

Jack founded DGA in 1994 and has over 30 years of experience in the world of Forensic Architecture. He received his Bachelor of Architecture Degree from the University of Texas, Arlington in 1971 and has been a licensed architect since 1978.

Our licensed areas include California, Nevada, Arizona, Colorado, Texas, and Florida. With this extensive coverage, we are equipped to deliver our high-quality solutions and support to clients throughout these regions, ensuring compliance with local regulations and standards while delivering exceptional results.

Do you have a project located in a state where we are not currently licensed? Don’t hesitate to contact us. We have the ability to obtain licensure in your state.

Current States We Work In

Affiliates