Primary Job Title Member of the Board of Directors Primary Organization 
NRG Yield
Gender Male
John Chlebowski has served as a director and Chairman of the Board of Directors of SemGroup since 2009. Chlebowski served as president and chief executive officer of Lakeshore Operating Partners, LLC, a bulk liquid distribution firm, from 2000 until his retirement in 2004.
From 1999 to 2000, he was a senior executive and co-founder of Lakeshore
Liquids Operating Partners, LLC, a private venture firm in the bulk liquid distribution and logistics business, and from 1998 to 1999, he was a private investor and consultant in bulk liquid distribution.
Prior to that, he was employed from 1994 until 1998 as president and chief executive officer of GATX Terminals Corporation, a subsidiary of GATX Corporation, and, prior to that, as vice president of finance and chief financial officer of GATX Corporation. He has served in the financial and energy segments of W.R. Grace & Co.
Chlebowski is a director of First Midwest Bancorp, Inc., a bank holding company, and Lead Independent Director of NRG Yield, Inc., a majority-owned publicly listed (NYSE) subsidiary of NRG Energy, Inc. which is a Fortune 500 company that owns and operates one of the largest and most diverse power generation portfolios in the United States. He is a former director of Laidlaw International, Inc., Phosphate Resource Partners, SpectraSite, Incorporated and NRG Energy, Inc.
Chlebowski graduated from Pennsylvania State University with a master’s degree in business administration. He also has a Bachelor of Science degree from the University of Delaware.
Chlebowski provides the Board a broad level of experience as a current and former director of a number of public companies and as a result of his executive leadership and financial management positions in diversified businesses, including, relevant to SemGroup’s business, the bulk liquid distribution business.
In addition, Chlebowski has significant experience serving on the audit committee, compensation committee and nominating and governance committee of other boards, including as chairman of all three committees, and qualifies as an “audit committee financial expert” as defined by the SEC. His broad and extensive management and financial experience, leadership skills and corporate governance and related board knowledge allow him to be a valuable contributor to the Board as its Chairman.
