HSMM employs approximately 600 professional, technical and support personnel in 17 offices from the Eastern Seaboard to the West Coast. Consistently ranked as one of the nations leading design firms, HSMM is in its 58th year of providing professional architecture and engineering services to clients throughout the nation and the world. Hayes, Seay, Mattern & Mattern, Inc. (HSMM) an AECOM company offers architectural and engineering consulting services to clients at locations across the United States and around the world. We provide comprehensive services for building and infrastructure development and for protection and restoration of the natural environment from 20 regional offices. From a four-person partnership founded in 1947,HSMM AECOM has become a nationally ranked, awarding winning firm with a staff of 600+ architects, engineers, and support professionals. Our growth is a direct result of our commitment to quality design, technological innovation, and client service. HSMM is organized by practice group, which allows us to better serve our clients by leveraging staff skills and experience across office and geographic boundaries. Each project benefits from the collaboration of our most talented and experienced people, regardless of location. HSMM??s five divisions include: * HSMM Buildings * HSMM Civil & Environmental * HSMM Transportation * Watershed Concepts * CTA Communications