HomeCompany > Principals

The name FDR Engineers is an acronym for the last name of our three founding Principals: Justin Fejfar, Edward di Girolamo, and Nabil Rahman. These three were the Principals of the two heritage firms that merged in early 2015 to create FDR Engineers. In addition to our founding Principals, each of our local offices is run by an experienced Principal.

All of FDR Engineers’ Principals have a wealth of knowledge and experience in diverse areas of structural engineering for both industrial and residential applications.

Justin Fejfar, P.E.
Principal & Co-founder

Mr. Fejfar, a Principal and Co-Founder of FDR Engineers, has more than 20 years of experience in commercial, industrial, and residential building design, dynamic analyses of steel structures for anti-terrorism blast loadings, three-dimensional static analyses, and linear finite element analyses.  Mr. Fejfar is a graduate of South Dakota School of Mines and Technology where he earned is M.S. in Civil Engineering and holds a Professional Engineers License in more than 15 states.  Mr. Fejfar has extensive experience in all types of structures including:  reinforced concrete, pre-stressed concrete, structural steel, cold-formed steel, heavy timber, log framing, and reinforced masonry.

Edward di Girolamo, P.E.
Principal & Co-founder

Mr. di Girolamo, a Principal and Co-founder of FDR Engineers, received his B.Sc. in Civil Engineering at SUNY Buffalo, New York. Mr. di Girolamo has more than 30 years of experience in building design, manufacturing, construction, demolition, and structural software development. His broad experience with structures encompasses nuclear plants, navy ships, bridges, & commercial and residential structures. To date, he is a named inventor on over twenty construction product patents. Mr. di Girolamo founded the light steel framing manufacturer,  The Steel Network, Inc. (TSN) in 1994 and the structural software firm, Applied Science International, LLC (ASI) in 2004.

Nabil Rahman, Ph.D., P.E.
Principal & Co-founder

Dr. Rahman, a Principal and Co-founder of FDR Engineers,  has more than 26 years of experience in building design, development of engineering software, as well as the special design and analysis of structures against extreme loads (progressive collapse, blast, and impact).  Dr. Rahman is a graduate of McMaster University, Canada where he earned his Ph.D. in Civil Engineering.  He has expertise in the area of cold-formed steel design utilized in the light steel framing industry and has recently served as the President of the Cold-Formed Steel Engineers Institute (CFSEI). Dr. Rahman is the current chairman of the ASCE-SEI Committee on Cold-Formed Steel.

Heath Hendrick, P.E. – Principal – Research Triangle Park, NC

Mr. Hendrick has over 11 years of experience in the engineering and construction industry, with extensive background in both design and construction management and administration. Mr. Hendrick is a graduate of The University of North Carolina at Charlotte, with a project resume spanning all facets of the commercial, government, educational, medical, and residential markets.

Robert Pennington, P.E. – Principal – Wilmington, NC

Mr. Pennington has more than 30 years of experience in the construction industry with a broad background in design, construction, and administration of many types of projects. Mr Pennington is a graduate of the University of Illinois Urbana-Champaign. His project resume includes construction and building systems design in a wide range of industrial, commercial, medical, educational, government, and residential markets.

Simon Hoppman, P.E. – Principal – Austin, TX

Mr. Hoppman has extensive experience in building facade, load bearing, and lateral analysis engineering. Mr. Hoppman has a Bachelors Degree in Civil Engineering from the University of Wisconsin-Platteville and holds Professional Engineering Licenses in multiple states. His experience includes a range of industries including residential and commercial and he has personally managed a vast spectrum of project types with a wide breadth of building materials.