Key Members


Dennis J. O’Brien

President and Chief Executive Officer and Member of the Board

Dennis J. O’Brien serves as the President and Chief Executive Officer. Mr. O’Brien has been involved in the propane and heating oil industry for over 32 years. He began his career in 1980 as a General Manager with Hodgdon Energy, Inc., a petroleum distributor in Berlin, New Hampshire. In 1988, Mr. O’Brien became a District Manager at Dead River Company, a regional petroleum distributor in Waterville, Maine where he continued to work until 2000.  Subsequently, Mr. O’Brien joined Irving Oil Company, a Canadian-based oil and natural gas refining/distribution enterprise headquartered in Portsmouth, New Hampshire with a New England business unit in Portsmouth, New Hampshire. While working for Irving until 2004, he served as Irving’s New England Operations Manager with responsibility for 20 field offices serving in excess of 100,000 energy customers.  In August 2004, Mr. O’Brien founded Seacoast Energy Consulting, a consulting company focused on delivering value to ownership and senior management for New England companies providing retail energy services.  Seacoast Energy Consulting provided energy companies throughout the Northeast with guidance on strategic planning, planning leadership training, management, sales and operational consulting, enterprise valuations and merger and acquisition assistance.  


Joseph A. Cook

Member of the Board

Joseph A. Cook is the President and Chief Operating Officer of Vieste Group, LLC.  He is also the founder and managing partner of Green, LLC, which was established in 2012 as a private equity venture to form and manage venture-based financing of sustainable infrastructure projects. Concurrently Mr. Cook also serves as the Chief Strategy Officer for ARETE Wealth Management, LLC, member FINRA/SIPC/NFA. He has been with ARETE since November 2008 and previously served as the firm’s Chief Investment Officer and Chief Compliance Officer.  Mr. Cook has been in the financial services and investment industry since 1999. 


Dave Muscatel

Member of the Board

Dave Muscatel is a senior financial and operational executive with a strong track record of turning around and growing businesses.  Mr. Muscatel left Patriarch Partners in December, 2013 after leading two successful turnarounds.  From 2009 to 2013, Mr. Muscatel served as CEO of Rand McNally, spearheading the company’s transition from the print publishing business into becoming a leading supplier of specialized navigation devices and electronic logging devices.  Prior to Rand McNally, Mr. Muscatel served for four years as COO and CFO of Performance Designed Products, a $300M video game accessories company also owned by Patriarch.  Prior to joining Patriarch, Mr. Muscatel worked as a management consultant for five years at Hilton Hotels Corporation from 2000 to 2005 and three years at Deloitte Consulting, specializing in financial process reengineering and merger integration projects.  Mr. Muscatel has a BA from Pomona College and a MBA from the University of Chicago Graduate School of Business.