Citadel

Founder and Chief Executive Officer

Kenneth C. Griffin

In 1987, Ken Griffin, a then-19-year-old sophomore at Harvard University, started trading from his dorm room with a fax machine, a personal computer, and a telephone. From this modest but ambitious beginning, Ken caught the attention of hedge fund pioneer and co-founder of Chicago-based Glenwood Partners, Frank Meyer, earning him the opportunity to establish what would one day become Citadel.

Ken founded Citadel in 1990 and has since served as the firm’s Chief Executive Officer. Today, Citadel is recognized as one of the most respected and successful investment firms in the world, and manages over $30 billion in capital for its partners.

Ken is a passionate philanthropist, supporting educational and cultural causes that drive community engagement and improvement. He has given over $600 million, personally and through the Citadel Foundation, to numerous organizations including The University of Chicago, the Ann & Robert Lurie Children’s Hospital, The Field Museum of Natural History, the Art Institute of Chicago, the Museum of Modern Art, and the American Museum of Natural History.

As a leader within the Chicago community, Ken actively participates in civic and cultural institutions, serving on the Board of Directors of the Chicago Public Education Fund, and the Board of Trustees for the Art Institute of Chicago, the Museum of Contemporary Art Chicago, the Whitney Museum of American Art, and The University of Chicago. He is also a member of numerous business organizations, including G100, the Civic Committee of the Commercial Club of Chicago, and the Economic Club of Chicago.

Ken earned his bachelor’s degree from Harvard University and is a proud supporter of his alma mater. In 2014, he donated $150 million to support need-based financial aid at Harvard, the largest gift in school history at the time.

Chief Legal Officer

Shawn Fagan

Shawn Fagan is Chief Legal Officer of Citadel, responsible for Citadel’s global legal, compliance, transaction management, and regulatory affairs functions. Shawn is a member of Citadel’s Portfolio Committee.

Prior to joining Citadel in 2005, Shawn was a Partner at Bartlit, Beck, Herman, Palenchar & Scott. Previously, he served as a clerk for Chief Justice William Rehnquist of the U.S. Supreme Court and Judge Douglas H.Ginsburg of the U.S. Court of Appeals for the District of Columbia.

Shawn is a member of the Board of Directors for the Program on International Financial Systems (PIFS) and a member of the Economic Club of Chicago. He graduated with honors from the University of Michiganwith a B.A. in Political Science and holds a J.D., magna cum laude, from Harvard Law School where he was a recipient of both the Sears Prize and John E. Thayer Award.

Global Head of the Client and Partner Group

Ed O’Reilly

Ed O’Reilly is Global Head of the Client and Partner Group at Citadel. He is responsible for managing the firm’s relationships with all investors globally. Ed is a Portfolio Committee member.

Prior to joining Citadel, Ed O’Reilly was a Partner and Head of Investor Relations for the Americas at Capula Investment US LP. Ed started his career at The O’Connor Partnership, Chicago, where he managed the non-investment aspects of a dynamic, derivatives market making and proprietary trading business within the Fixed Income, Currencies and Commodities (FICC) and Equities businesses in a COO function. Throughout his career with O’Connor / Swiss Bank Corporation / UBS and later with Peloton Partners, Ed was based in a variety of financial centers: Chicago, Singapore, Zurich and London. This experience ultimately led him to spend 18 years abroad.

Ed is a member of The Economic Club of New York, The Aspen Institute Society of Fellows, and The Development Board for the Brunswick School in Greenwich, Connecticut.

Ed received his Master of Business Administration from Duke University and a bachelor’s degree from Miami University, Oxford, Ohio.

Chief Corporate Affairs and Communications Officer

Julie Andreeff Jensen

Julie Andreeff Jensen is Chief Corporate Affairs and Communications Officer at Citadel. She is responsible for leading internal and external communications, marketing and brand communications, executive communications and philanthropy.

Prior to joining Citadel, Julie was a partner at the Brunswick Group, a global advisory firm, where she advised c-suite executives of Fortune 500 companies on financial transactions, reputation and crisis management, change leadership, and public affairs.

Before Brunswick, Julie worked in politics leading political campaigns and started her career as an aide to the late Senator Edward M. Kennedy. Julie is also an attorney and practiced law and government relations in Washington, D.C. advising clients on regulatory and litigation matters. She holds both an undergraduate and a law degree from American University in Washington, D.C.

Julie is a member of The Executives’ Club of Chicago, Arthur Page Society, and serves on the board of the Shedd Aquarium.

Chief Administrative Officer

Scott Johnston

Scott is the Chief Administrative Officer of Citadel. As CAO, Scott works with the Chief Operating Officer to manage business controls and drive efficiency across the global organization. Prior to becoming CAO in 2018, Scott served as Chief Operating Officer of Citadel Securities.

Scott joined Citadel Securities in 2017 from Tower Research Capital, where he was a partner and COO responsible for business development, operations and business management. Prior to joining Tower, he was Managing Director and Chief Information Officer at the Chicago Mercantile Exchange (CME), responsible for GLOBEX and clearing technology. During his time at the CME, Scott was a member of the management team that led the exchange through demutualization and an IPO in 2002.

Earlier in his career, Scott worked at UBS as Managing Director in Foreign Exchange and Interest Rates and later as Global Head of Treasury Products Technology. He was also a software developer, options trader and business manager with O’Connor and Associates, and started his career in financial services as a senior programmer with Townsend Analytics.

Scott is a graduate of the University of Michigan.