Meet the Team

Chris Fillmore took over as President & CEO of Rock Energy Systems in May of 2025. He has extensive executive experience as an operator in private equity-backed businesses over the last fifteen years. Previously, he was CEO of Alco Manufacturing, VRC Engineered Solutions and President of MW Components. Prior to that he was the CCO for Consolidated Precision Products, one of the largest castings companies in the Aerospace and Defense market.

Chris currently lives in Hinckley, OH but works out of the Janesville, WI HQ. He received his bachelor’s degree from Wittenberg University, where he was a two-time captain on the varsity basketball team, and his MBA from Baldwin Wallace University. He has two daughters, Janey and Lucy and enjoys travel and golf when he is not in the office.

Domenic Grisanzio started as the Chief Financial Officer of Rock Energy Systems in April of 2022. His responsibilities include managing all the company’s financial aspects along with managing Human Resources / Legal compliance and Information Technology. In his role, he leads and provides strategic direction to an experienced finance team covering accounting, financial planning and reporting, banking and compliance while partnering with the senior executive team to execute on the company’s growth strategy.

Prior to joining Rock Energy Systems, Domenic served as the Chief Financial Officer in several private equity backed businesses, as well as holding senior financial and operating roles in both public and privately held businesses over the last twenty years.

Domenic currently lives in Rockford, IL. He received his bachelor’s degree from Rockford College. He is currently married to his wife Tracy, they have two daughters and a son, Madeleine, Isabelle, and Sam. He enjoys boating, skiing, and physical fitness during his time away from the office.

Tim Burgin joined Rock Energy Systems in September 2019 as part of the company’s acquisition of EnergyLogic. Soon after, he was appointed Vice President of Sales and Marketing. With more than 20 years of leadership experience in sales, operations, and business development, Tim has a proven track record in driving growth through multi-channel strategy and brand development.

Before joining Rock Energy Systems, Tim served as Vice President at EnergyLogic, where he played a critical role in shaping the company’s sales and operations strategies. His earlier career includes business development and customer operations positions in the contract manufacturing industry with TS3 (electronics) and Kimball International (furniture), as well as over a decade as General Manager at Telco Inc.

Tim holds a bachelor’s degree from the University of Tennessee. He works primarily at the company’s headquarters in Janesville, Wisconsin, and supports operations from a satellite office in Franklin, Tennessee.

Based in Brentwood, TN, Tim enjoys weekends in his outdoor kitchen and spending time with his wife, Karen, their blended family of five children, two children-in-law, and three grandchildren.

Andy Kuhl joined Rock Energy Systems as the Operations Manager in October 2021. He has years of experience in manufacturing operations management, including roles in material management and international procurement. Prior to joining Rock Energy Systems, he held plant manager and leadership roles at Acme Industrial Products, an aerospace fastener manufacturer, site leader role with Honeywell Thermal Solutions, an engineering thermal solutions provider for the metals heat treating industry, and Eclipse Inc, as a production manager and materials manager in the metals heat treating industry.

Andy currently lives in Machesney Park IL with his wife Nancy. He received his bachelor’s degree in industrial technology management from the University of Wisconsin Platteville. Andy enjoys working on home improvement projects and spending time with family.

John McCown has been the Engineering Manager at Rock Energy Systems since March of 2018. He has over 25 years of engineering experience with a heavy focus on New Product Development in the combustion industry. Prior to joining Rock Energy Systems, he was at Eclipse Combustion for over 15 years where he held various roles supporting the development and application of burner and control technologies. After graduating with his bachelor’s degree from Illinois State University, he started his career at Harper Wyman which was a supplier for burners and controls for gas cooking appliances.

John lives in Rockton, IL with his wife and three boys. When not at work, he can often be found at ice rinks around the Midwest, as the McCown family evolved into a “crazy” hockey family when the boys were young and all three were playing. John is currently on the Board of Directors for the Rockford Lightning High School Hockey Program, where his youngest son plays. In the summer months he also enjoys the occasional round of golf or just relaxing by the pool on the weekends.