RETTEW Welcomes Callahan as Project Manager in the Firm’s Environmental Sciences Group

Lancaster, Pa. – RETTEW, an Engineering News-Record top 500 design firm providing engineering, transportation, environmental consulting, planning and surveying services, recently welcomed Michael P. Callahan, CPSS, LSS, as a project manager in the firm’s environmental sciences group.   

“Mike’s vast experience in soil science greatly benefits our clients and our firm,” said Mark Lauriello, PE, president, RETTEW. “I welcome Mike to RETTEW.” 

As a project manager in RETTEW’s environmental sciences group, Callahan oversees soil science operations and activities, provides budget oversight and administration, enforces quality assurance standards and builds and maintains client relationships. Additionally, he reviews and compiles information relating to environmental permitting activities and is responsible for coaching and mentoring staff. 

Callahan has more than 10 years of experience in the discipline of soil science, much of which involves the application of soil morphology, classification and chemistry to peer reviewed research projects; onsite soil and site evaluations for septic and stormwater suitability; hydric soil delineation; wetland and stream delineations and restoration and agronomic evaluations. He has worked in research institutions, the federal government and the private consulting community.

Callahan graduated from Penn State University with a bachelor’s degree in environmental soil science and a master’s degree in soil science. He is a certified professional soil scientist (CPSS), a licensed soil scientist (LSS) and a sewage enforcement officer. He is a member of the Soil Science Society of America, the National Society of Consulting Soil Scientists and the Pennsylvania Onsite Wastewater Recycling Association. He resides in Palmyra, Dauphin County, Pa.

RETTEW, ranked by Engineering News-Record magazine as one of the top 500 design firms in the United States, provides engineering, transportation, environmental consulting, planning, surveying and related consulting services to a broad range of clients in the mid-Atlantic region. Beginning in 1969 as a single-person office, today RETTEW has more than 200 employees. Offices are located in Bethlehem, Chambersburg, Lancaster, Mechanicsburg, Schuylkill Haven, and Williamsport, Pa.; and Liberty and Margaretville, N.Y. For more information on any of RETTEW’s services, please call 1-800-RETTEW-5 (1-800-738-8395) or e-mail