ClearSign Technologies Corporation announced that Bruce A. Pate is stepping down from the ClearSign Board of Directors. Concurrently, the Company announced the appointment of energy industry veteran Gary J. DiElsi to the open board position. Gary DiElsi is a seasoned energy executive with a broad background of over 40 years of experience from private equity, major global enterprises, smaller industrial companies, and startup ventures, including both turnaround and growth situations.

In the early part of Mr. DiElsi's career, he spent over twelve years with Chevron Corporation in a wide range of engineering, operations, strategic and managerial positions. Mr. DiElsi also spent four years with Linde AG's US subsidiary and two years with UOP building process gas purification units as well as hydrogen production/purification facilities worldwide. From 2000 to 2006, Mr. DiElsi was responsible for Oxbow Industrial Services, a 24/7 global operation providing refinery and terminal services in the Americas, holding the position of Executive Vice President of Oxbow when he left.

From 2006 to 2012, Mr. DiElsi was an operating executive with energy private equity firm First Reserve Corporation, where he was active in a wide range of investments involving refining, biofuels production, renewable technologies, power development, marine shipping, liquid terminals, and gasification development for hydrogen and power production. From 2012 to 2017, Mr. DiElsi served as Managing Director at Alinda Capital Partners, an infrastructure investment firm. At Alinda, Mr. DiElsi was on the Investment Committee for energy investments and was responsible for evaluation of opportunities and management of energy infrastructure investments, including ESG, growth strategies, operational improvements, financial performance and board representation.

Most recently, since April 2018, Mr. DiElsi has been the Managing Member and Founder of Mountain Pass Energy Investing LLC, where he serves as a senior investment and operations advisor to private equity firms and limited partners investing in both the alternative and conventional energy industries. Mr. DiElsi also serves as a member of the Board of Directors of Blue Tide Environmental, a private company sponsored by energy private equity firm Tailwater Capital. Mr. DiElsi has a Bachelor of Science in Mechanical Engineering (thermal sciences), Summa Cum Laude, and was the recipient of a Rockwell International/Union Carbide Fellowship while earning a Master of Engineering in Mechanical Engineering, both from Rensselaer Polytechnic Institute.