Mark J. DeTrempe, Managing Director & Partner  
(847) 444-2215

Mr. DeTrempe’s responsibilities include client development and transaction management and execution. Mr. DeTrempe has worked in structured finance since 1986. He began his career at First Chicago Leasing Corporation, where he became Vice President and Co-Head of the Sales and Syndications Group. From 1992-2010, he was Managing Director/Partner of Cornerstone Financial Advisors Limited Partnership. In 2010, he co-founded Cornerstone Financial Advisors, LLC. In addition to his general transaction responsibilities, Mr. DeTrempe is responsible for strategic direction of Cornerstone and its portfolio management business. Mr. DeTrempe received a Masters of Management from the J.L. Kellogg Graduate School of Management of Northwestern University, and a B.A. in Economics from the University of Notre Dame.

Aaron J. Karstens, Managing Director & Partner
(847) 444-2224

Mr. Karstens is responsible for client development, transaction management and the structuring and analysis of transactions, credit and project finance related.  From 2000-2007, Mr. Karstens held the positions of Associate, Manager, and Vice President at Cornerstone Financial Advisors Limited Partnership. He then worked in the Structured Asset Finance department for Wachovia, where he was principally engaged in structuring lease investments, as well as tax partnerships for renewable energy projects. In 2010, he co-founded Cornerstone Financial Advisors, LLC. Mr. Karstens has an M.B.A. in Finance and a B.S. in Mathematics, each from The University of Iowa.

Jason B. Klapper, Managing Director & Partner
(847) 444-2217

Mr. Klapper is responsible for client development, transaction management and the structuring and analysis of transactions, credit and project finance related.  Prior to joining Cornerstone Financial Advisors Limited Partnership in 1999, where he held positions of Associate, Manager and Vice President, Mr. Klapper held positions in capital markets and underwriting for Aries Capital Inc., a real estate finance group. In 2010, he co-founded Cornerstone Financial Advisors, LLC. Mr. Klapper graduated from the Wharton School at the University of Pennsylvania with a B.S. in Economics, concentrating in Finance and Real Estate.

Tyler Fauerbach, Managing Director
(847) 444-2209

Mr. Fauerbach brings over 15 years of experience in renewable and conventional energy project finance, investment, development and construction.  He has worked on the origination, due diligence and portfolio management of over 2 gigawatts of power generation assets in the US and Latin America.  This includes utility, commercial and residential-scale solar, utility scale wind, gas fired power generation, biomass and hydroelectric generation. In addition, Mr. Fauerbach has experience in the oil and gas, mining and agribusiness industries.  Most recently Mr. Fauerbach was a Managing Director with Entropy Investment Management (“EIM”), the renewable energy investment platform for York Capital Management. Prior to joining EIM, Mr. Fauerbach headed the project finance efforts for solar developer and EPC, Sunetric.  Prior to joining Sunetric, Mr. Fauerbach established and led US Bank’s power project finance practice. Mr. Fauerbach started his project finance career at CoBank, ACB. Mr. Fauerbach holds an MBA from the University of Denver and a BS in Natural Resources and Environmental Sciences from Purdue University.

Brent A. Meller, Vice President 
(847) 444-2218

Mr. Meller became a member of the Cornerstone team in August 2011 and is responsible for client development, transaction management and the structuring and analysis of transactions, credit and project finance related. Prior to joining Cornerstone, Mr. Meller worked within the Asset Finance Group at Citibank focusing on aviation, rail, power and renewable energy financings and portfolio management. Mr. Meller has also worked at Fifth Third Bank in their corporate finance department and at Dana Commercial Credit in their structured finance division. Mr. Meller has an M.B.A from the University of Michigan and a B.S. in Business Administration with a concentration in Finance from Bowling Green State University.

Brian P. Fairchild, Vice President
(847) 444-2210

Mr. Fairchild is responsible for the structuring and analysis of transactions and providing credit and project finance advisory services. Before joining Cornerstone in August 2014, Mr. Fairchild was a Director at Robert W. Baird & Co., advising clients on mergers and acquisitions, capital market transactions, and other corporate finance activities since 2007. Mr. Fairchild received an M.B.A from Kellogg School of Management and a B.S. in Economics from Vanderbilt University.

Michael Gadsden, Director
(847) 444-2213

Mr. Gadsden joined Cornerstone in 2017, having previously worked in energy market analytics, valuation, risk management, and restructuring advisory. He specializes in pricing complex portfolios of contracted and merchant energy assets. Mr. Gadsden was previously a Managing Consultant with Filsinger Energy Partners, where he represented Energy Future Holdings during one of the power industry’s largest Chapter 11 restructurings. As a graduate student, he analyzed energy and climate change policy for the White House Council on Environmental Quality. Mr. Gadsden holds an M.S. in Applied Economics and Management from Cornell University and a B.A. in Environmental Studies from Dartmouth College.