Leadership Promotions

GMB is pleased to announce the following leadership promotions:

Director of Operations:

Stephen L. Marsh, P.E., LEED AP, CPSWQ has been promoted to East Region Director of Operations. Marsh is a Senior Vice President with the firm and has served on the Board of Members since 2013. He began his career with GMB in 1994 as a civil engineer focused on hydrology and low-impact development, ultimately establishing the firm’s Site / Sustainable Design Group. Marsh has served as prime engineering consultant for the award-winning Bayside community in Selbyville, Del. for over 20 years. He now oversees our Salisbury, Md. and Seaford, Del. office operations.

Jason M. Lytle, P.E. has been promoted to West Region Director of Operations.  Lytle joined GMB in 1998 and has served as a Senior Vice President on the Board of Members since 2019. He has designed and managed water and wastewater engineering projects throughout the Chesapeake Bay region, including Cambridge Farms Water Treatment Plant in Frederick County, Md. which recently started construction. Lytle oversees our Sparks, Md. office operations.

Sr. Vice President / Board Member:

Christopher B. Derbyshire, P.E., Morgan H. Helfrich, AIA, LEED AP, and Katherine J. McAllister, P.E. have been selected as Senior Vice Presidents on GMB’s Board of Members, after serving 6 years as Vice Presidents.

Derbyshire joined GMB’s Water / Wastewater Engineering Group in 2002 and now serves as Group Leader. His expertise lies in the planning, managing, designing, and constructing of water and wastewater treatment facilities throughout Maryland and Delaware. He is currently working with the Town of Rock Hall, Md. and the City of Seaford, Del., where he is designated as City Engineer, on upgrades to their wastewater treatment plants.

Helfrich has served as GMB’s Architectural Group Leader since 2016, after joining the firm in 2006. A registered architect in Maryland, Delaware, and Virginia, she works with public and private clients on a wide variety of projects, including residential, commercial, industrial, hospitality, healthcare, institutional, and educational. Currently, she is managing the second GMB design of a new community health center in Federalsburg, Md. for Choptank Community Health Systems, Inc.

McAllister joined GMB’s Water / Wastewater Engineering group in 2005. As a Project Director in the Salisbury office, she has extensive knowledge of municipal public works, funding agency requirements, rate structures and grant writing, as well as strong technical skills. She serves as City Engineer for the City of Fruitland, Md. where she recently completed a new water supply well and upgrades to the water treatment plant.

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