About Us

James Petersen

2016-04-06 Website Headshop CroppedJames began his career in this industry in 1986 and founded Petersen Engineering, Inc. in 1992. His expertise has expanded over the years from HVAC engineering and plumbing design to encompass building science, enclosure design, and integrated design.

James is passionate not just about his work, but also about the people who perform the work. Using a collaborative, collegial approach, James and his project teams consistently leverage the unique strengths of all participants to create well-designed, occupant-friendly, high-performance buildings.

James is a licensed Professional Engineer in New Hampshire (#8139), Massachusetts (#36560), New York (#089372) and Maine (#7231), as well as a LEED® Accredited Professional. He received a Bachelor of Science in Mechanical Engineering and a Bachelor of Arts in Philosophy from the University of New Hampshire.

“We are ready and willing to work hard for our clients and support their goals.”

James Parkington

James began his consulting mechanical engineering career in 1999 in San Francisco. He returned to New England in 2006, working at another engineering firm for nearly two years before joining Petersen Engineering in November 2007.

He has significant experience with the design and implementation of mechanical systems for laboratories, research facilities, hospitals, clinics, theaters, colleges and universities, and high-rise structures.

James is committed to the sustainable, efficient, and economical design of mechanical systems, with a particular interest in control strategies that allow building systems to react dynamically to occupant needs.

He provides project management and high-level engineering for a variety of project types. Conceptual reports, basis of design documentation, specifications, control sequences, flow diagrams, and on-site evaluations are just a few of the services that James provides as a “hands-on” project engineer.

James received his Bachelor of Science in Mechanical Engineering from the University of New Hampshire in 1997. He is a licensed Professional Engineer in New Hampshire, Massachusetts, and California, as well as a LEED® Accredited Professional.

“A common thread for all of us at Petersen Engineering is that we’re serious about high-quality engineering and construction as well as pursuing a sustainable life/work balance. We have a strong sense of common purpose, respect, and collaboration, and I like the people who work here. Our crew has the grit and determination needed to solve problems and balance the unpredictability we often encounter working in the design and construction field.”

Sarah Carter

Sarah began her consulting mechanical engineering career in 2004 in Washington, DC. She returned to New England and joined Petersen Engineering in the fall of 2009.

She has experience with the mechanical design of multi-family housing, water and wastewater treatment plants, office buildings, and large government facilities, including battle command training centers, maintenance facilities, data/command centers, and military training campuses.

Sarah offers engineering skills within all aspects of the design process: HVAC design and calculations, evaluation reports, energy modeling, control sequences, specification writing, and construction administration. Through her extensive energy modeling experience, she has developed a strong interest and proficiency in highly efficient mechanical systems.

Sarah received her Bachelor of Science in Mechanical Engineering from the University of Vermont in 2003. She is a licensed Professional Engineer in New Hampshire, Massachusetts, and Virginia, a Construction Documents Technologist (CDT), and a LEED® Accredited Professional.

“I like having the ability to see a project all the way through here at Petersen Engineering, including early system selection through the construction of the building. I also enjoy the laid-back office environment and flexibility.”

Chuck Dudas

Chuck began his consulting career in San Francisco in 2007, where he gained experience with the HVAC and plumbing design of high-performance office and school buildings, including multiple LEED Platinum and Net-Zero Energy projects. He moved to New England and joined Petersen Engineering in the spring of 2011.

Prior to his consulting career, Chuck was a construction manager at the Boston location of one of the largest contracting companies in the United States. Firsthand experience in the construction process helped shape his interest in designing mechanical systems that are highly efficient while remaining mindful of constructability.

At Petersen Engineering, Chuck works as a design engineer who provides detailed mechanical design work for a variety of projects. Chuck especially enjoys helping integrate the mechanical systems into the overall project, either through Revit or detailed coordination between the disciplines.

Chuck is a licensed Professional Engineer in California and a LEED® Accredited Professional; he also has a Massachusetts contractor’s license. He received his Bachelor of Science in Mechanical Engineering from Messiah College, where he graduated Magna Cum Laude in 2003.

“I enjoy the variety of projects that we get to work on, as well as the opportunity to work on high-performance buildings at a firm committed to green engineering. I also enjoy working with my colleagues.”

Jason Ngai

Prior to joining Petersen Engineering in 2011, Jason worked as an assistant to the facilities manager of a Vermont hospital. This, along with being exposed to different aspects of building architectural design and engineering as an undergrad, trained him to not only think as an engineer, but also to understand the perspectives of other project team members.

Working at Petersen Engineering, Jason continues to pursue his path as a sustainable mechanical engineer. He enjoys designing effective, energy efficient, and innovative mechanical systems while utilizing the skills he obtained from his “hands-on” style courses in college.

Jason received a Bachelor of Science in Architectural Engineering Technology and a Bachelor of Science in Sustainable Design and Technology from Vermont Technical College in 2011. He is a licensed Professional Engineer in Maine, as well as a LEED Green Associate. He is currently working towards his Professional Engineer license and LEED® Accredited Professional credential.

“While I am just a few years into my professional career, my direct contact with clients, architects, and other engineers helps to diversify and expedite my engineering experience. Ultimately, communication skills are just as important as the math behind the designs, which is why I’m happy to be doing more than just the CAD drafting I’d be doing at a larger firm.”

Ted Hetzel

206-04-15_Ted Hetzel croppedTed graduated from the University of Vermont in 2014 with a Bachelor of Science in Civil Engineering.

After graduation Ted became interested in building science and energy efficiency and received a certificate in renewable energy/energy efficiency from Greenfield Community College. At GCC he was very involved with a design project to improve the heating and ventilation systems for a 1,000 sq ft greenhouse which is used to demonstrate energy efficient technologies on campus.

His interest in building science and energy efficiency redirected his career path to high performance buildings. Ted completed an internship at the Northeast Sustainable Energy Association (NESEA) which led to starting with Petersen Engineering in the spring of 2015. Ted is a Engineer-in-Training (E.I.T.), LEED® Accredited Professional, and a Certified Passive House Consultant.

“I enjoy working at Petersen Engineering because there is a commitment to improve building performance on every project that we do. Working here, I am exposed to a wide variety of project types, new design approaches and endless opportunities to learn new skills.”

Andy Poshadel

andy-websiteAndy joined Petersen Engineering in May 2016. After over a decade in academia, he is excited to be working on the front lines of high-performance building design.

Andy received Bachelor of Science, Master of Science, and Doctor of Philosophy (Ph.D.) degrees in Mechanical Engineering from Cornell University. Prior to joining Petersen Engineering, he was a visiting lecturer at Cornell, where he taught Analysis of Mechanical and Aerospace Structures.

Andy is a LEED AP BD+C and Engineer-In-Training (E.I.T.), working towards becoming a licensed Professional Engineer.

“At Petersen Engineering, I enjoy working on a diverse array of projects, including new construction, occupied rehabilitation, and repurposing of existing structures. I am proud to be part of a dedicated team of professionals, whose work has far-reaching, positive, human and environmental impacts.”

Christa Williams

Christa is the Business Manager at Petersen Engineering, responsible for bookkeeping and other office management tasks. The firm is very fortunate that Christa rejoined the team in the summer of 2013 after seven years away running her own bookkeeping and consulting business.

Christa received her Bachelor of Science in Equine Management from the University of New Hampshire in 1995. She lives in Durham, NH with her husband and two children and enjoys riding horses, running, skiing, and hiking.

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