Who We Are

Lisa Roy has over 30 years of experience in the global energy and sustainability markets and a proven leadership track record as a global senior executive at a Fortune 100 company. Lisa brings this extensive knowledge, a deep understanding of commercial and operational execution, and proven experience in general management and mergers and acquisitions to Optimum Energy. Throughout her career, Lisa has actively supported United Way and Compassion charities. She has also been involved in various national and local not-for-profit boards. Lisa holds a bachelor’s degree in electrical engineering from Louisiana State University.

Ben Erpelding, P.E., C.E.M, Chief Technology Officer, Ben has over 15 years of experience in energy efficiency, chiller plant optimization, and combined heat and power. Ben has worked on over 1000 chilled water plants throughout the United States, Asia, Europe and the Middle East. Ben received his Master of Science, with an emphasis in combined heat and power, a bachelor of science in mechanical engineering, Magna Cum Laude, from San Diego State University. Ben is a registered professional mechanical engineer in the State of California.

Sarah Greenewald, Chief Financial Officer, joined Optimum Energy in 2012, bringing a strong drive for environmental change. She has held various roles at Optimum in finance and operations, overseeing finance and accounting, M&A, investor relations, project management, sales operations, pricing, and human resources. Sarah brings over 12 years of experience in corporate finance across a wide range of industries. She has a BA in Finance, summa cum laude, from Portland State University.

Eric is a proven leader and executive in the energy, sustainability, and utility management industries, with unique skills that combine executive sales leadership, technical expertise, and a comprehensive understanding of key business drivers and value creation. A registered Professional Engineer in the State of New York and LEED AP Certified, Eric utilizes a diverse background in leadership, management, sales, and engineering to increase business value both internally and externally. He is recognized by customers and colleagues for quality, integrity, and a commitment to their success. In his current role, Eric is responsible for leading sales, marketing, and customer success teams to achieve client objectives such as energy and sustainability goals, increasing asset value, improving reliability, and mitigating operating risk. His career has focused on energy-efficient design, construction, and operations of facilities in industries worldwide, including Manufacturing, Pharmaceuticals, Healthcare, Education, District Energy, and Commercial and Multifamily Real Estate. Eric is an expert in designing and operating large-scale heating and cooling systems, with extensive experience in chilled water, heating, and air handling systems, energy audits, retro-commissioning best practices, and Building Automation System (BAS) Sequence of Operations. He holds a B.S. in Mechanical Engineering from Johns Hopkins University.

Jason Whittier, Vice President of Product Development, has over 20 years of experience developing platforms in the building space to make buildings integrated better, more energy efficient, and smarter. Prior to Optimum, Jason worked at Buildings IOT and Tridium, Inc to help them develop cutting edge platforms that are used worldwide. Jason has a Bachelor of Science in Computer Science and a Master of Science in Information Management from Arizona State University.

Ken Bernhard has over 15+ years in the HVAC and energy sector and a proven track record in the energy-as-a-service (EaaS) industry, driving innovation, fostering growth, and delivering exceptional results. At OE, he plays a key role in leading successful projects and establishing strategic partnerships. His first-mover expertise in the EaaS and mechanical construction industries uniquely positions him to support OE’s clients, deliver and enhance building  and operational efficiency and improve asset performance and reliability.

With over 15 years of diverse experience in the energy efficiency and HVAC engineering industry, Alex brings expertise and a passion for driving innovation and sustainability. Focusing on healthcare and higher education, Alex has led the development, design, implementation, and construction of over $100 million in projects to improve existing facilities’ operations and energy efficiency across the United States. At OE, he plays a key role in leading engineering project management teams that manage the Engineering scopes of work, all Engineering site activities, multiple projects, and any other tasks necessary to guarantee and demonstrate successful project outcomes throughout a project’s life cycle.

Jesse Ohm, PE, CEM, LEED AP, Principal Engineer, comes to Optimum Energy with 12+ years of experience in the HVAC industry, with the last 5 years focusing on central plant optimization design and execution. His expertise include analyzing & re-designing industrial chiller plants, optimizing plant operations, maximizing system efficiency, and data analysis verifying energy savings. His skill set highlights include; Industrial system design, leading projects through execution, commissioning, measurement & verification, and utility incentives. Jesse has performed 70+ detailed site surveys with detailed analysis on chiller plants ranging from 500-ton chiller plants to 56,000-ton multi plant district cooling systems throughout the country. Within the 5 years experience at Optimum, he has performed 200 optimization retrofit studies and executed 25 large scale central plant projects from initial findings through verified savings. Jesse is a licensed professional engineer in Pennsylvania, with passionate in-depth experience in industrial central plants and energy savings.

Ian Dempster, Sr. Director of Product Innovation, Ian manages product development at Optimum Energy from ideation and development to distribution and support. In 2005, Ian became one of the first members of Optimum; now he directs multiple simultaneous R&D projects, drawing on a 16-year engineering career that spans three continents. After graduating from the University of Johannesburg in South Africa, he spent the next eight years applying his interest in controls to increasingly large and complex industrial plants and building systems across Johannesburg and London. Ian, a certified energy manager (CEM), maintains Optimum’s industry-leading standards and collaborates with all stakeholders in the product development process. His projects realize 30% to 60% reductions in HVAC energy consumption.