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Nathan Brown, P.E.

Mr. Nathan Brown has over 10 years of experience with Integrated Engineering Consulting Engineers, Inc. involving site investigations, design, engineering, project management, and construction administration of plumbing and HVAC projects. His expertise has been demonstrated on health care, institutional, and commercial projects. He has strong experience in the related areas of plumbing, medical gas piping, and HVAC design for radiation therapy and imaging equipment installations.  


Mr. Brown has strong project management skills and has handled large and small projects at hospital and higher education facilities from design through construction.


Mr. Brown has worked on LEED® certified projects and is experienced in energy efficient design and LEED® documentation.

Rahim Peyvan, P.E.

Mr. Rahim Peyvan has extensive experience in the design of electrical/mechanical systems encompassing 40+ years as a design engineer, project engineer, field engineer, electrical contractor, facility and maintenance Engineer.


Mr. Peyvan founded Integrated Engineering in 1997, which created high industry respect for its practice in academic and higher education projects; including research facilities, classrooms, performance centers, and gymnasiums.  He has been involved in numerous health care projects of all sizes.  Mr. Peyvan has also been involved in many infrastructure projects such as substations, campus emergency power, data centers, central plants, and other utility distribution systems.


Due to Mr. Peyvan’s hard work, persistence, and expertise he has been able to establish himself as a well-qualified and competent building services engineer (electrical/mechanical) in Southern California. He has been recognized for his performance, qualifications, and accountability especially in the fields of health care, higher educational institution, campus and research facilities.


Henry Lee, P.E.
Associate Principal

Mr. Henry Lee has a broad range of experience with institutional projects and has worked with several major architectural firms.  He has over 30 years experience in electrical engineering and project management. He has been responsible for several major projects with the University of California in Irvine, Los Angeles and San Diego, Kaiser Permanente, City of Hope, Torrance Memorial Medical Center, and Little Company of Mary.


As an associate and project manager with Integrated Engineering, he manages projects for mechanical, electrical and plumbing disciplines and has a lead role in the electrical design. Mr. Lee has been involved in both large and small projects with varying responsibilities from conceptual design to contract administration.