Serving as president of Wheelabrator since 2005, Mark A. Weidman is responsible for the safe and efficient operation of Wheelabrator’s $2.5 billion asset base, consisting of 16 waste-to-energy and five independent power facilities. Currently these facilities employ over 1,000 people and generate annual revenues in excess of $800 million. Prior to his appointment to president, Weidman had been vice president of operations since 2001. In this previous role, Weidman was instrumental in setting and achieving goals ensuring the continuous improvement in all areas of the company’s operation. He was also the driving force behind attaining OSHA VPP status for all Wheelabrator facilities. Before joining Wheelabrator, Weidman served as the president and CEO of the processing division at Synagro Technologies, Inc. He had also worked for Wheelabrator/Bio Gro for 11 years, where he was appointed president in 1996. Weidman has experience in industrial and municipal water and wastewater treatment operations and hazardous waste management as well. Weidman holds an engineering degree from Pennsylvania State and is a registered Professional Engineer.

Gary Aguinaga joined Wheelabrator in 1990 and has held many positions at the company throughout his career. As vice president, Aguinaga is directly responsible for the maintenance and reliability of Wheelabrator’s 21 power plants and the performance of Wheelabrator’s 250 plant maintenance personnel. Previously, Aguinaga served as director of operations services, where his primary responsibilities included operations performance reporting and analysis and training and field operations support. Aguinaga also served as a key member of the budget, critical repair and capital expenditure review team. Prior to working in Hampton, Aguinaga worked in the field at the Wheelabrator South Broward, North Broward and Ridge facilities, where he was involved in all three start-ups. During these years, he held positions of increasing responsibility, including shift supervisor, EH&S director, plant start-up manager, maintenance manager, operations manager and plant manager. Aguinaga holds a Bachelor of Science degree in Mechanical Engineering from the U.S. Merchant Marine Academy, as well as a USCG Chief Engineer's license, an ASME Refuse-to-Energy Chief Facility Operator's Certification, and a completion certificate from the Tuck Business School Executive Education program at Dartmouth College.

David Beavens brings over 30 years of energy-related experience to the position of vice president of finance. Beavens is responsible for the management of finance controls including strategic/tactical planning, financial analysis, MIS, financial reporting, re-negotiation of long-term contracts and personnel administration. He has also played a strategic role in administering 25 long-term complex contracts for financing and constructing Wheelabrator projects. Beavens joined Wheelabrator in 1988 as controller and has been serving as vice president of finance since 2001. Beavens holds a Bachelor of Arts in Accounting/Finance from Alvernia College and an Associates of Science in Business Administration from Penn State.

As vice president of human resources, Clay Campini is responsible for human capital management including policy, strategic planning, learning and development, recruitment, performance management, compensation, benefits and union and employee relations. Some of his projects include the roll-out of Breakthrough Performance Leadership at Wheelabrator, implementation of management training sessions for the company’s plant managers, and improved diversity representation. Campini has over three decades of human resources experience, both domestically and internationally. Prior to joining Waste Management/Wheelabrator in 1990, Campini was instrumental in the start-up of the United Parcel Services’ international operations over his 20-year career with the company. Campini holds a degree from the Rhode Island School of Business and is a former member of the United States Air Force.

Arthur Cole began working at Wheelabrator in 1977 when he joined the maintenance department at the company’s first waste-to-energy facility, in Saugus, Massachusetts. Today, as vice president of technical services, Cole oversees plant engineering for all of Wheelabrator’s power plants. His duties include: overseeing troubleshooting tactics, equipment modifications and retrofits and managing multi-year R&M strategies to level spending while improving plant performance. During his more than 30-year career with the company, Cole has been granted seven U.S. Patents in the areas of refuse combustion and air pollution control systems. Cole is a member of the National Board of Boiler and Pressure Vessel Inspectors and Shriners of North America, and is a graduate of Essex Agricultural and Technical Institute in Hawthorne, Massachusetts. 

Francis Ferraro brings more than 30 years of experience in government, environmental affairs and communications to his position as vice president of public affairs. Ferraro manages government affairs and corporate communications for Wheelabrator’s waste-to-energy and independent power business.  Along with his role at Wheelabrator, Ferraro contributes to several major environmental, regulatory and public affairs committees; he is Chairman of the U.S. EPA MSW Combustion Research and Development Peer Review Committee. Prior to joining Wheelabrator in 1988, Ferraro held management positions in environmental and regulatory affairs with several notable energy companies. Ferraro holds an Associates Degree in Applied Science in Chemical Engineering Technology from Norwalk State Technical College, a Bachelor of Science degree in Chemical Engineering from the University of Oklahoma and a Masters of Business Administration degree from Kent State University in Ohio.

Matthew Killeen is responsible for all environmental regulatory programs including air quality, water quality, solid and hazardous waste management, water supply, wetlands and land use. He is also responsible for directing environmental due diligence investigations and site assessments, conducting environmental studies and analyses, supervising staff involved in facility environmental, health and safety activities, permitting and site assessment activities and directing and managing the activities of consultants. Killeen has more than 26 years of professional experience dealing with solid waste and power generation projects and activities. Since joining Wheelabrator in 1989, his projects have included waste-to-energy facilities, co-generation projects, wood and tire-fired electric generating facilities, RCRA regulated carbon reactivation facilities, sludge drying facilities, ash residue landfills and research and development activities associated with ash utilization. Killeen holds a Bachelor of Science and Master of Science degree in Environmental Resource Management and Policy from State University of New York College of Environmental Science and Forestry at Syracuse.

As general counsel, Michael O’Friel is responsible for all Wheelabrator legal matters. His principle responsibilities include managing litigation and legal issues associated with project development and environmental compliance, negotiating electricity sales agreements and structuring acquisitions, divestitures and financings. Since joining the company in 1991, O’Friel has held various legal positions, leading to his promotion to general counsel in 1999. Prior to Wheelabrator, he worked for a private law firm. O’Friel graduated with a Juris Doctorate from Boston College Law School and an Associate degree in Government from Harvard University. He also attended the Tuck Executive Education Program at Dartmouth College.

As Wheelabrator’s vice president of engineering, David Raymond is responsible for the management, engineering and construction of all major capital projects. Under his leadership, Wheelabrator’s engineering department provides technical guidance and performance evaluations in support of the company’s permitting and business development activities. Additionally, Raymond and his team provide engineering support to all Wheelabrator waste-to-energy facilities and independent power plants. This includes system troubleshooting and performance studying and testing. Since joining Wheelabrator in 1990, Raymond has been responsible for the engineering, design and construction of the utility and industrial power plants. He has served as both an engineer and project manager for several projects ranging from greenfield development, permitting, detailed engineering and construction management through start-up and acceptance testing. Raymond holds a Bachelor of Science degree in Mechanical Engineering from Northeastern University and an Associates degree in Engineering from Wentworth Institute. He is a registered Professional Engineer in four states.

With over three decades of experience, Jack Ristau has been a driving force in developing, constructing, and operating municipal infrastructure facilities, including solid waste management and energy recovery projects, in the United States and overseas. Since joining Wheelabrator in 1984, he has developed many notable resource recovery business activities as well as directed several projects in the Far East, Mexico, Turkey, United Kingdom, Puerto Rico, the Bahamas, Jamaica, and Barbados. Currently, Ristau is director of business development and manages waste-to-energy project opportunities in the United States and Canada, supervising proposal development and customer contract negotiations. Prior to joining Wheelabrator, Ristau held project management positions at MITRE Corporation, Hayden, Harding and Buschanan Engineers, Inc., and Metcalf and Eddy, Inc. Ristau holds a Bachelor of Science degree in Engineering from Penn State and a Masters of Science degree in Industrial Management from Northeastern University.

As vice president of operations, William Roberts is responsible for providing the overall direction and guidance for all operational activities for Wheelabrator's waste-to-energy and independent power facilities. Working closely with the environmental, health and safety, maintenance, and engineering departments, Roberts ensures the company meets its business plan and financial goals by implementing improved processes, management methods and increasing performance standards. Roberts joined Wheelabrator in 1987, and has held roles of increasing responsibility including plant manager of several facilities, general manager of Wheelabrator's Broward County facilities and regional vice president of the Mid-Atlantic Region. Roberts holds a Bachelor of Science in Business Administration from Mount Saint Mary College, New York, and a First Class Engineers license in the State of Massachusetts.