Precis Engineering Announces New Principals and Manager Promotions


John Volence, PE, CEM, and Scott Bierwerth, PE, have been named Principals. Todd Rohn, PE, and Vince McGilloway, PE, have been promoted to Mechanical Engineering Managers.

John Volence, Scott Bierwerth, Vince McGilloway and Todd Rohn

Precis Engineering, Inc.,  an MEP engineering firm headquartered in Ambler, Pa., with offices in Cary, N.C., and San Diego, Cal., announces two additions to its leadership team. John Volence, PE, CEM, and Scott Bierwerth, PE, have been named Principals. Volence retains his concurrent title of Senior Director, Mechanical Engineering; Bierwerth remains Senior Director, Electrical Engineering. In addition, Todd Rohn, PE, and Vince McGilloway, PE, have been promoted to Mechanical Engineering Managers.

“John Volence and Scott Bierwerth have proven themselves as engineers committed to the Precis philosophy of principal-led project leadership,” said Precis Founding Principal and President Robert Dick, PE. “Their promotions mark our confidence in their executive leadership abilities and their ongoing dedication to our clients’ operational and business successes while maintaining our distinct Precis corporate culture.”

John Volence, PE, CEM | Principal and Senior Director, Mechanical Engineering

Volence joined Precis in 2007 and has risen to lead the company’s 35-person mechanical engineering department. An engineer with 14+ years of experience in pharmaceutical, biotechnology, and higher education projects, he has completed complex HVAC and MEP designs and assessments across the U.S. As a Certified Energy Manager (CEM), Volence offers expertise in energy modeling, analysis, and system operation. He holds a B.S. in Mechanical Engineering from the Pennsylvania State University and membership in the International Society of Pharmaceutical Engineering (ISPE) and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). He resides with his family in Horsham, Pa.

“I am excited to join a leadership team that's committed to maintaining the culture that has made Precis special throughout our sustained growth,” said Volence. “I look forward to enhanced opportunities to direct and develop our mechanical staff with a focus on engineering fundamentals and technical excellence.”

Scott Bierwerth, PE | Principal and Senior Director, Electrical Engineering

Bierwerth joined Precis in 2009 and has risen to lead the company’s 20-person electrical engineering department. He has spent 12+ years designing complex electrical power distribution systems for pharmaceutical, healthcare, data centers, higher education, and corporate projects. His expertise includes design for demand-driven lighting systems and specialized laboratory equipment connections, along with electrical analyses such as arc flash and short-circuit studies. He holds a B.S. in Architectural and Electrical Engineering from the University of Kansas and membership in the Institute of Electrical and Electronics Engineers (IEEE) and its Industry Applications Society. He resides with his family in Malvern, Pa.

“I’m enthusiastic about joining Precis leadership and continuing to grow and improve our electrical team’s capabilities,” said Bierwerth. “I will work to support our team, clients, and mission of continuous improvement.”

In additional promotions, Precis elevated Todd Rohn, PE, and Vince McGilloway, PE, to Mechanical Engineering Managers. Rohn joined Precis in 2015 as a Senior Mechanical Engineer. He has 18+ years of professional experience and expertise in the design and application of complex HVAC systems for cGMP facilities and clean rooms. He is a member of ISPE, the American Society for Mechanical Engineers (ASME), and the Pennsylvania Society of Professional Engineers (PSPE) for which he previously served as Philadelphia Chapter board secretary. McGilloway joined Precis in 2012 as a Mechanical Engineer. He has 9+ years of professional design and analysis for pharmaceutical and educational facilities and labs with expertise in HVAC and central mechanical utility systems. He is a member of ASHRAE. Both hold B.S. in Mechanical Engineering degrees from Drexel University.

As Mechanical Engineering Managers, both Rohn and McGilloway will expand their efforts to the technical development, personnel management, project direction, and quality control of the firm’s Mechanical Engineering Department.

“Todd and Vince display unwavering accountability for all aspects of their work, including technical and commercial project success and team mentorship. Their promotions formalize the leadership they have shown for many years with Precis,” said Volence.

About Precis Engineering

Precis Engineering offers strategically sensitive and technically complex engineering services to support clients’ business goals. From three offices across the U.S., Precis provides mechanical, electrical, plumbing, HVAC, fire protection, life safety, and process engineering services for clients in the pharmaceutical, biotechnology, university, utility, and research and development markets. The firm has been honored for its engineering leadership and sustainable approach, with project recognition including the LEED Gold Morphotek Pilot Plant, winner of an ISPE Facility of the Year award. The company marks its 16th year in practice in 2021. For additional information, visit

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