Christopher D. Pappas is President and Chief Executive Officer of Trinseo, a leading global materials company dedicated to innovate and deliver for its customers, with strong global positions in four business areas -- polystyrene and styrenic polymers, emulsion polymers, polycarbonate and engineered compounds, and PBR and SBR synthetic rubbers.

Pappas brings to Trinseo a 35-plus year distinguished career and proven operating experience in the chemicals and plastics industry, and is an accomplished leader of complex global businesses. In his role as Trinseo's President and CEO, he leads the company's commitment to help customers meet their needs with innovative new products and sustainable solutions.

Pappas started his career at The Dow Chemical Company, where he gathered industry experience in a number of sales and managerial positions between 1978 and 1996.

In 1996 he joined DuPont Dow Elastomers LLC where he held several leadership positions, initially as Vice President of Ethylene Elastomers and from 1999 onwards as Commercial Vice President.

He joined NOVA Chemicals Corporation in 2000. At Nova, he assumed roles with increasingly global responsibilities, as Senior Vice President & President, Styrenics (2000-2006), Chief Operating Officer (2006-2008), President and Chief Operating Officer (2008-09), and finally as President and CEO (2009).

He was named to lead Trinseo (formerly known as Styron) in March 2010, and assumed the role in June 2010 upon the sale of Trinseo from Dow to Bain Capital Partners in June 2010. Pappas serves on the Executive Leadership Team and the Board of Directors of Trinseo S.A.

Pappas also serves on the Board of Directors for FirstEnergy Corp. (NYSE: FE) and Univar Inc. (NYSE: UNVR). Previously, he has served on the Board of Directors for Methanex Corp., NOVA Chemicals Corporation, and Allegheny Energy, Inc.

In 2017, Pappas received the Leadership Award for Outstanding Corporate Reinvention from The Chemical Marketing and Economics (CME) group of the American Chemical Society’s New York Section for his visionary leadership, focus on safety and technology, financial discipline, and for Trinseo’s growth which tripled in value during the preceding three years.

Pappas holds a Bachelor of Science degree in Civil Engineering from The Georgia Institute of Technology and an MBA from The Wharton School of Business at The University of Pennsylvania. He is a member of the External Advisor Board for Georgia Tech’s School of Civil & Environmental Engineering.

He is married and has three children.

Angelo Chaclas was named Senior Vice President and Chief Legal Officer in January 1, 2015. In his role, Chaclas supports all capital markets, transactional, compliance, commercial, regulatory, governance, intellectual property and other operational activities of the company worldwide. This includes responsibility for all governance activities of the Board of Directors as a U.S. public company, all governance activities of the company and its affiliates under Luxembourg laws, rules and regulations, and applicable compliance in all other regulatory jurisdictions. Chaclas reports to Chris Pappas, President and CEO of Trinseo and is a member of the Executive Leadership Team.

Chaclas brings to the company a 30-year career in the legal and engineering industries. Chaclas joined Trinseo (formerly known as Styron) in December 2010 as the Associate General Counsel – Division Counsel & Chief IP Counsel, which included holding global responsibility for all intellectual property matters, working closely with the Research and Development organization on patents, trade secrets, trademarks, technology licensing agreements, and joint development agreements. He also managed commercial legal activities for several Styron businesses, and established internal best practices and optimized law firm relationships during the company’s start-up phase.

Prior to joining Trinseo, Chaclas served as Deputy General Counsel and Chief Counsel for the software division of Pitney Bowes while leading its Intellectual Property, Technology Law and Procurement legal functions.

From 2001 to 2010, Chaclas served on the Board of Directors for the Intellectual Property Owners Association, holding a position on the Executive Committee from 2008 to 2010 in addition to Treasurer during his last year. Chaclas has also served on the Board of Directors for the Association of Corporate Patent Counsel from 2003 to 2013. During that time, Chaclas held a seat on the Executive Committee from 2008 until 2011 in addition to his role as President in 2011. Today, Chaclas serves on the Board of Directors for the Unionville Sports Council as President.

Chaclas holds a bachelor’s degree in Mechanical Engineering from Tufts University and a Juris Doctorate from Pace University School of Law.

Jeff Denton was named Senior Vice President for Corporate Development and Business Services in October of 2014. In this role, he is responsible for I/T, Facilities Management, Dow services, Corporate Development and Mergers and Acquisitions.

Denton also serves on the Executive Leadership Team of the company, and the Operating Committee of the Board of Directors.

Denton joined Trinseo (formerly known as Styron) upon its sale from Dow to Bain Capital Partners in June 2010, and was named Vice President, Feedstocks and Corporate Services.

Denton’s career in the chemical industry spans over 25 years. He joined The Dow Chemical Company in Midland, Michigan in 1987 in the Commercial Development Program. In 1988, Denton transferred to the Cleveland Sales Office, where he served as field sales representative in the Basic Chemicals business. In 1994, he returned to Midland and served in various marketing and commercial roles for the Engineering Plastics and Styrenics business at Dow. In 2004, Denton took over leadership of North America Polystyrene as the Polystyrene product director. In this role, he was instrumental in the strategic transformation of Styrenics at Dow. In 2007 and 2008, he led commercial aspects of the creation of the Americas Styrenics joint venture.

After completion and launch of the Americas Styrenics joint venture, Denton moved into Basic Plastics at Dow and was named director, joint venture implementation. In this role he worked on another strategic transformation involving the JV between Dow and the Kuwait Petrochemical Company (KPC), formally known as K-Dow. Denton worked on venture creation and implementation activities and negotiated product supply agreements between Dow, KPC and the venture. When the JV was halted days before start-up, he continued the theme of strategic transformation and moved immediately into similar work for the creation of Styron. In August of 2009, after the business concept was firmly in place, Denton was named to the management team of the Styron Division of Dow, and then moved to Styron upon its formation in June 2010.

Denton serves on the Board of Directors for Americas Styrenics and other local associations in the Midland area.

Denton earned a B.A. in Business Administration from Alma College in Alma, Michigan, in 1987.

Hayati Yarkadas joined Trinseo in November of 2015 as Senior Vice President and Business President for the Performance Materials Division. Since joining the Company, his position was expanded to include responsibility for Global Procurement and the Asia Pacific region while continuing lead the Latex Binders and Synthetic Rubber business segments.

Yarkadas brings to the company more than 20 years of experience in materials businesses and proven track record of business management and leadership skills.

Prior to joining Trinseo, Yarkadas led the food ingredient business of Tate & Lyle in Europe as Senior Vice President and General Manager, based in London. Prior to that, Yarkadas spent over 17 years with DuPont in many different countries across the world after completing his MBA.

Most recently Yarkadas served as General Manager of the DuPont Teijin Films joint venture, where he was responsible for the whole P&L and transformation of the business. Previously, he was Global Business Director for DuPont Advanced Glass Interlayers and held a series of roles in sales, sales management, Six Sigma, marketing, product management and business management in plastics and chemicals.

Throughout his career, Yarkadas gained significant operating and global leadership skills with various roles in Turkey, the UK, Switzerland, the US, and Luxembourg. He started his career in manufacturing and R&D at Borusan Mannessmann, where he gained operation experience early in his career.

Yarkadas has a master’s degree in Mechanical Engineering from Istanbul Technical University and an MBA from Imperial College London. He reports to Christopher Pappas, President and Chief Executive Officer of Trinseo, and is a member of the company’s Executive Leadership Team. Yarkadas is based in Trinseo’s Horgen, Switzerland office.

Yarkadas is married and has two daughters.