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Executive Leadership

Our executive leadership team inspires a global workforce of over 3,000 employees, all operating with the goal of providing exceptional service to our customers.

Meet our Executives.




David Bradley
President & Chief Executive Officer

David joins SI Group as President & Chief Executive Officer in March 2019. He comes to SI Group having most 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 Krafton, 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.

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Richard Preziotti
Senior Vice President & President, Additives

Rich brings nearly 30 years of experience to SI Group, having recently served as President & CEO of Vertellus, a global specialty chemical company serving customers in many end markets including crop protection, nutrition, pharmaceutical & medical, plastics, coatings, adhesives, among others. Prior to joining Vertellus, Rich was the Vice President and General Manger of Honeywell’s Specialty Chemicals and Fluorine Products business based in Morristown, New Jersey.

Rich began his career with General Electric in various manufacturing and sales and marketing positions. Following this, he joined Allied Signal (now Honeywell International) in 1991 as a financial analyst. He subsequently held leadership positions for the Fluorocarbons, Sterilant Gases, Fluorine Products and Industrial Fluorines businesses. Rich also served as the Vice President for Business Development for Honeywell’s Specialty Materials Division and Vice President and General Manager for the Specialty Wax and Additives Business.

In this role, Rich will lead SI Group’s additives business, comprised of Fuels & Lubricants, Rubber & Adhesives, Oilfield Solutions and Polymer Additives. Rich graduated from Union College with a Bachelor of Science degree in electrical engineering. He also holds an MBA in finance from Columbia University.

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Paul Tilley
Senior Vice President & President, Chemical Intermediates & Industrial Resins

Paul has over 25 years of experience in the chemical industry, beginning his career at SI Group as a plant engineer in 1993. Paul then went on to hold several roles including a four-year assignment in England as the Managing Director of SI Group-UK, Ltd.

Returning to the U.S. in 2003, Paul assumed the role of Vice President of the Chemical Division. In 2008, as Senior Vice President of SI Group, he led the transformation to a market-focused organization and is credited with the development of the company’s first global market strategy.

In 2013, Paul was appointed Senior Vice President, North America and Global Key Accounts. In 2016, Paul was appointed Senior Vice President, Business Excellence and Global Key Accounts overseeing commercial and operational excellence, and as a result of his longstanding customer relationships, all global key accounts. In his current role, Paul leads the Chemical Intermediates & Industrial Resins strategic business unit.

Paul graduated from the University of Louisiana Lafayette with a bachelor's degree in mechanical engineering.

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Christopher Cornille
Senior Vice President, Supply Chain Services

Chris began his career at SI Group in 2010, initially serving as the Director of Sales for North America. In 2014 Chris assumed the role of Executive Director for New Business Development, where he successfully led the 2014 acquisition of two Albemarle manufacturing sites in the U.S. and China.

In 2015, Chris joined the company’s executive leadership team. In his current role, Chris is charged with optimizing SI Group's global supply chain and procurement capabilities to maximize efficiencies and streamline systems.

Prior to joining SI Group, Chris spent over 20 years at Cabot Corporation, where he held several executive positions such as Global Commercial Director for Rubber Products, Managing Director of Indonesia, and North America Sales Director of Specialty Products.

In 2013, Chris was appointed as an advisory board member for Monolith Materials. He is a member of the International Executive Resource Group and holds a bachelor's degree in biochemistry from Benedictine University in Illinois.

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Brooke Manrique
Senior Vice President, Human Resources & Communications

Brooke joined SI Group in 2013 as Public Relations and Marketing Communications Manager. She has since held several leadership roles within the organization, including Senior Director, Global Talent Development, Brand & Communications. In that role, she led the company’s global talent and leadership development strategy, employee engagement initiatives, succession planning, and early career programs. In 2015, Brooke directed SI Group’s global brand transformation, an 18-month project that impacted customers in over 90 countries and facilities on five continents.

Prior to joining SI Group, Brooke held leadership roles in a variety of industries including telecommunications, financial, education, non-profit and public affairs. Her 20-year career encompasses a diverse range of functions including human resources, communications, strategic marketing and strategy development.

Brooke earned a bachelor’s degree in international relations and Russian area studies from American University in Washington D.C., and an MBA from the Robert H. Smith School of Business at the University of Maryland.

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Thomas J. Masterson
Senior Vice President, General Counsel & Regulatory Affairs

Tom joined SI Group in 2006, initially serving as the company’s first in-house attorney. He has since successfully led the development of the company’s legal department into a global function, joining the company’s executive leadership team in 2015.

In his current role, Tom is responsible for global legal and regulatory affairs. He has spent most of his career as company counsel to multinational corporations in the petrochemicals and natural resources industries. He has extensive international experience, including five years residence in Tokyo, coupled with a working knowledge of the Japanese language.

Prior to joining SI Group, Tom served as counsel to Mitsubishi Corporation in Tokyo, as well as General Electric's former Plastics business. Tom began his legal career in Texas as an associate of the law firm Baker & Botts LLP.

Tom graduated cum laude from Cornell Law School and he is a member of the State Bars of New York and Texas.

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Wei Ru
Senior Vice President, Engineering & Process Technology <

Ru has nearly 40 years of chemical engineering industry experience and has held several management and executive roles.

Prior to joining SI Group in 2018, Ru served as Senior Vice President, Engineering at Addivant for five years, at its inception, as part of the Chemtura acquisition. Prior to Chemtura, Ru worked for Ciba Shanghai, Ciba and BASF U.S. for nearly 20 years, and she also spent 12 years working with the Sinopec Gaoqiao Chemical Engineering Design Institute of China.

Ru was born and raised in Shanghai and moved to the U.S. in 1999. She graduated from the East China University of Science and Technology, Shanghai School with a bachelor’s degree in chemical engineering and she is fluent in Chinese and English.

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Patrick Weinberg
Senior Vice President & Chief Financial Officer

Patrick has nearly three decades of deep financial expertise and a strong background in global specialty chemicals and pharmaceuticals. Prior to joining SI Group in 2018, Patrick is credited with being one of the first employees of Addivant, a leading global supplier of specialty additives, and an SK Capital portfolio company since 2013.

In 2012, Patrick joined SK Capital Partners as an Operating Partner to help acquire the Addivant business from Chemtura. He assumed the role of Chief Financial Officer at Addivant in 2013. Prior to that, he held several executive positions at Royal DSM in Europe and the U.S. in nutrition, pharma and specialty chemicals.

Patrick earned a Doctoral degree in auditing, a Bachelor of Science degree in economics, and an MBA from the University of Tilburg in the Netherlands. Patrick was born, raised and educated in the Netherlands, working internationally for almost 30 years, and coming to the U.S. 18 years ago.

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Rich White
Senior Vice President, Manufacturing & EHSQ

Prior to joining SI Group in 2018, Rich served as Chief Supply Chain Officer at Addivant. Rich has more than 30 years of manufacturing expertise in leading Fortune 500 and private equity-owned organizations.

Prior to his experience at Addivant, Rich served as Chief Operations Officer at Avantor Performance Materials and for the solar division of STR Holdings, Inc. He also served as Vice President of Manufacturing & Supply Chain at Vertellus Specialities, Inc., as well as leading roles at E.I. Dupont de Nemours & Co., Honeywell International and Celanese Corporation. Rich has deep experience and business acumen in driving manufacturing excellence on a global scale.

Rich holds a bachelor’s degree in chemical engineering from Mississippi State University.

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