Meet Our Mentors
David Bradley
David Bradley currently serves SI Group as President & Chief Executive Officer since March 2019. David also sits on the Board of Directors of Ecovyst. Prior to this, David recently served as President and CEO of Nexeo Solutions, an international distributor of chemicals, plastics, composites, and environmental services, since 2011. Previously, David spent seven years at Kraton Performance Polymers, Inc. where he held several key executive positions including Chief Operating Officer, Vice President of Global Operations, and Vice President of Business Transformation. Prior to joining Kraton, he served as the Lexan Manufacturing Manager at GE Plastics’ Mount Vernon, Indiana, site. Mr. Bradley served in a variety of leadership positions for GE Plastics from 1994 to 2004, which included roles in business process development and Six Sigma. David holds a B.S. in Chemical Engineering from the University of Louisville, Kentucky.
Kevin Fogarty
Kevin Fogarty currently serves as Chairman of the Board of Directors at Ecovyst. Mr. Fogarty has had a long and distinguished career in the chemicals industry, most recently serving as the Chief Executive Officer and Board Member of Kraton Corporation from 2008 until March 2022. Mr. Fogarty led Kraton’s October 2009 IPO and later helped lead the sale of Kraton to DL Holdings in March 2022. He is a member of the Board of Directors of Glatfelter Corporation, OPAL Fuels and previously served on the Board of Directors of the American Chemistry Council. Mr. Fogarty holds a B.S. in Engineering from Dalhousie University.
Joey Gullion
Joey Gullion was appointed Chief Executive Officer, of Shrieve Chemical, in August 2025 and brings extensive leadership experience across the specialty chemicals, distribution, and industrial manufacturing sectors. Prior to his current role, he served as Chief Commercial Officer at SI Group, a leading global producer of additives and chemical intermediates, where he led the Commercial and R&D organizations. Earlier in his career, Joey spent eight years in chemical distribution leading the market-focused specialty business at Nexeo Solutions, which was later acquired by Univar Solutions, and held senior leadership roles including General Manager of the Valves and Mechanisms group at Curtiss-Wright Flow Control and Vice President of Marketing at Alimak Hek. Joey holds a bachelor’s degree in marketing from the University of Minnesota and an M.B.A. from Rice University. He is passionate about developing talent and sharing real-world leadership experiences. Outside of work, Joey enjoys traveling, experiencing new cultures, golfing, and reading.
Lisa Harper
Lisa Harper currently works as a Site Finance Controller at SABIC Innovative Plastics, a Chemicals & Related Products company. Lisa is a member of Senior Management and has been with SABIC since 2011. Prior to joining SABIC, Lisa held multiple finance leadership roles at GE Plastics from 1996 to 2004. Lisa earned her B.S. in Accounting from the University of Southern Indiana and her Masters focused in Business Administration through the GE Financial Management Program. Her hobbies are gardening, reading, walking her dogs and especially spending time with family and friends.
Danette Persyn
Dr. Persyn was born and raised one of 6 daughters outside of San Antonio, Texas in Helotes. She graduated Valedictorian of her senior class and received 11 scholarships. She attended the University of Texas at Austin on a full academic private scholarship from the Terry Foundation. She credits the receipt of her scholarship as an incredible gift that changed the course of her life. After graduating summa cum laude with a Bachelor of Arts in Biochemistry in 1993. She attended Baylor College of Medicine where she was inducted into the Alpha Omega Alpha (AOA) Honor Society and graduated with her Doctor of Medicine in 1998. Her Anesthesiology residency from 1998-2002 was with Baylor College of Medicine and its affiliated hospitals in Houston. Her most recent work since 2011 as a private practice physician has been in the regenerative, wellness, and cosmetic medicine areas. Currently she is the Medical Director and physician at Aesthetic House in The Woodlands.
Shawn Williams
Shawn Williams currently serves as the executive chairman of the board of managers of Covia Holdings LLC. Mr. Williams joined Covia in December 2020 as chairman and was interim CEO for seven months before transitioning to the executive chairman role in January 2022. Prior to Covia, Mr. Williams served as the chief executive officer of Nexeo Plastics Holdings, Inc., from April 2019 until June of 2020 and from September 2012 to March of 2019 as executive vice president of Nexeo Solutions, Inc. Prior to joining Nexeo Solutions, from 2007 to 2012 Mr. Williams served as president of Momentive Global Sealants and Momentive Performance Materials, Inc. Earlier in his career, Mr. Williams spent 22 years serving in industrial sales and manufacturing leadership roles at General Electric Company and led businesses globally in the Americas, Europe and Asia across a broad sector of markets. Mr. Williams has also served on the board of directors of Kirby Corporation since July 2021, and on the board of directors of Tetra Technologies, Inc. since March 2021. Mr. Williams earned his MBA from the Haas School of Business at the University of California, Berkeley, and a B.S. in electrical engineering from Purdue University.