The Relentless Pursuit of Opportunity

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Our mission is to be the most successful investment team in the world.

We analyze global markets with discipline and focus, and employ a diverse range of strategies in an effort to deliver consistent investment returns to our capital partners. We work harder and see farther, empowering the world’s most talented minds with the resources and opportunities they need to achieve extraordinary results.

We drive our mission to be the most successful investment team in the world by hiring extraordinary colleagues, constantly improving, continuously learning, rewarding results, and winning with integrity.

Our Team


Kenneth C. Griffin

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 $31 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.

Gerald A. Beeson

Chief Operating Officer

Gerald A. Beeson

Gerald A. Beeson is the Chief Operating Officer of Citadel. As COO, he is responsible for the firm’s key corporate functions globally and is a member of Citadel’s Portfolio Committee. Prior to becoming COO in 2008, Gerald served as Citadel’s Chief Financial Officer, a role he has held since 2003. He joined Citadel in 1993 as an intern and was among the company’s first employees.

Gerald received his MBA from the University of Chicago and a bachelor’s degree in Commerce with concentrations in Accountancy and Finance from DePaul University. He is registered as a certified public accountant with the State of Illinois. In addition, he has served on several industry related committees or boards.

Gerald is a trustee of DePaul University and a 2014 recipient of the DePaul University Presidential Medal. He is also a member of the Board of Advisors for Catholic Charities of the Archdiocese of Chicago as well as the Board of Directors for Marist High School and Big Shoulders Fund. Gerald is a member of the 2017 Class of Henry Crown Fellows within the Aspen Global Leadership Network at the Aspen Institute.

Shawn Fagan

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.

Joanna Welsh

Chief Risk Officer

Joanna Welsh

Joanna Welsh is Chief Risk Officer at Citadel. Joanna chairs Citadel’s Portfolio Committee and advises in determining risk tolerance levels for the strategies, businesses, and the funds as a whole.

Prior to joining Citadel, Joanna was at Tudor Investment Corporation for 15 years, most recently serving as Chief Risk Officer. With more than 20 years of experience in financial services and risk management, she also held senior risk positions at Commerzbank and Nomura.

Joanna received a master’s and bachelor’s degree from Oxford University.

Ed O’Reilly

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.

Dr. Ben S. Bernanke

Senior Advisor

Dr. Ben S. Bernanke

Dr. Ben S. Bernanke is a Distinguished Fellow in residence with the Economic Studies Program at the Brookings Institution. From February 2006 through January 2014, he was Chairman of the Board of Governors of the Federal Reserve System, having been appointed to that position by both Presidents Bush and Obama. Dr. Bernanke also served as Chairman of the Federal Open Market Committee, the System’s principal monetary policymaking body.

Before his appointment as chairman, Dr. Bernanke was chairman of the President’s Council of Economic Advisers, from June 2005 to January 2006. He was a member of the Board of Governors of the Federal Reserve System from 2002 to 2005.

From 1994 to 1996, Dr. Bernanke was the Class of 1926 professor of Economics and Public Affairs at Princeton University. He was the Howard Harrison and Gabrielle Snyder Beck Professor of Economics and Public Affairs and chair of the Economics Department at the university from 1996 to 2002. Dr. Bernanke had been a professor of Economics and Public Affairs at Princeton since 1985.

Before arriving at Princeton, Dr. Bernanke was an associate professor of Economics (1983-85) and an assistant professor of Economics (1979-83) at the Graduate School of Business at Stanford University. His teaching career also included serving as a visiting professor of Economics at New York University and at the Massachusetts Institute of Technology. He received a Bachelor of Arts degree in Economics in 1975 from Harvard University (summa cum laude) and a Doctor of Philosophy degree in Economics in 1979 from the Massachusetts Institute of Technology.

Julie Andreeff Jensen

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.

Daniel Dufresne

Global Treasurer

Daniel Dufresne

Daniel Dufresne is Global Treasurer at Citadel. He oversees the firm’s Treasury and Operations teams across the U.S., Europe and Asia with responsibility for Citadel’s liquidity framework, secured funding, capital allocation, cash and collateral exchange, counterparty exposure and the firm’s clearing and settlement activity. Mr. Dufresne is also a member of Citadel’s Portfolio Committee.

Mr. Dufresne joined Citadel in 1999 as Head of Repo Trading for Global Rates. In this role, he established the infrastructure to fund the Global Rates business and later traded as a PM. In 2003, he joined Treasury as Head of Liquid Products Financing and was named Global Treasurer in January 2008. Prior to joining Citadel, Mr. Dufresne was the global repo trader for D.E. Shaw’s fixed income business.

Mr. Dufresne has been a member of the Treasury Market Practices Group since 2007 and a member of the Treasury Borrowing Advisory Committee since 2015. He was also a member of the Task Force on  Tri-Party Repo Infrastructure which began in 2009. That same year, he was named to Crain’s Chicago Business “Forty Under Forty”.

He received his Master of Business Administration with Honors from the University of Chicago Booth School of Business and his bachelor’s degree from Cornell University.

Scott Johnston

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.

Track Record

For more than two decades we have sought new ways to capitalize on market opportunities. With everything we achieve, we recognize the fundamental truths that inspire us to always keep pushing forward.


Linkedin Top Companies

Citadel named to Linkedin’s Top Companies for 2018 list.

Investment capital $31 billion as of October 1.


Citadel Awarded In-House System of the Year by Risk Magazine

Citadel reaches $30 billion in investment capital.


Leadership Recognized

Citadel receives “A” grade in Institutional Investor’s alpha report card, wins five awards from Absolute Return, and is Named Hedge Fund of the Year by Risk Magazine. Firm is named one of the country’s 50 best workplaces for recent college graduates by Great Place to Work. Launches Aptigon Capital, fundamental equities trading business based in Greenwich.


Continued Focus on Performance

Crossing the $25b billion mark in investment capital, Citadel is named “Hedge Fund of the Year” by Institutional Investor and named one of the country’s 30 best workplaces in financial services and insurance by Great Place to Work. Ben Bernanke, former Chairman of the Federal Reserve, joins the firm as senior advisor. Citadel’s Risk Management Center recognized as “Best Risk Management Initiative” by the American Financial Technology Awards.


Multistrategy Hedge Fund Manager of the Year

Institutional Investor Magazine recognizes Citadel as Multistrategy Hedge Fund Manager of the Year. The firm’s Global Fixed Income business wins Best Global Macro Fund of the Year from Absolute Return.


Citadel ranked best overall hedge fund by Hedge Funds America


Firm expands operations to Boston, Dallas and Houston


Hedge Fund Hall of Fame

Institutional Investor’s Alpha creates the Hedge Fund Hall of Fame, naming Ken Griffin among the 14 inaugural inductees. Citadel launches Surveyor Capital, a fundamental equities trading business, as well as its tactical funds and macro businesses.


Citadel receives Euromoney’s best global hedge fund award


Opens offices in Hong Kong

Acquires large portions of Amaranth Advisors’ energy portfolio and Sowood’s credit portfolio. Firm opens offices in Hong Kong.


Launch of foreign exchange business

Firm crosses $10b threshold in investment capital. Launches foreign exchange business.


Moves into global headquarters in Chicago


Launches commodities business

Following the collapse of Enron, Ken Griffin leads an effort to hire energy traders, meteorologists, and quantitative researchers, launching the firm’s commodities business. Operations expand to San Francisco.


Launches equities business


Launches credit strategies business. Opens London office


$1b in investment capital

With a team of 100 employees, Citadel reaches the $1 billion mark in investment capital and is recognized with the Relative Value/Arbitrage Award by Alternative Investments. Fixed income business launches.


Firm reaches $500m in investment capital


Name changes to Citadel. Statistical arbitrage business launches

The firm is renamed “Citadel”, reflecting the firm’s strength as it expanded and diversified to more markets worldwide.


Griffin Moves to Chicago

Firm founded as Wellington Financial Group. Launches convertible bond arbitrage business.



As a student at Harvard, Ken Griffin reads an article in Forbes that inspires him to begin trading convertible bonds. He persuades his dorm’s janitor to allow him to place a satellite dish on the rooftop in order to access real-time information. From this modest beginning, Griffin raises nearly $1m, catching the attention of Frank Meyer, a hedge fund pioneer and co-founder of Chicago-based Glenwood Partners.


Global Headquarters
131 South Dearborn Street
Chicago, IL 60603 USA

TEL 312-395-2100
FAX 312-267-7100

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New York

601 Lexington Avenue
(Between 53rd & 54th St)
New York, NY 10022 USA

TEL 1.646.403.8200
FAX 1.646.403.8268

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120 London Wall
London EC2Y 5ET
United Kingdom

Pillar 3 Disclosure Documents
Citadel Europe LLP
Citadel Securities (Europe) Limited
UK Stewardship Code Disclosure
Citadel Europe LLP

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San Francisco

4 Embarcadero Center
San Francisco, CA 94111 USA

TEL 1.415.354.7200

One Market Plaza
San Francisco, CA 94105 USA

TEL 1.415.354.7300

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Hong Kong

16th Floor
Two International Finance Centre
8 Finance Street
Central, Hong Kong

TEL 852.3667.5500
FAX 852.3667.5501

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300 Crescent Court
Suite 250
Dallas, TX 75201 USA

TEL 1.972.892.1700

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33 Benedict Place
3rd Floor
Greenwich, CT 06830 USA

TEL 1.203.900.6000

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Bank of America Center
700 Louisiana St.
Suite 4600
Houston, TX 77002 USA

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One Grand Canal Square
5th Floor
Dublin 2
Dublin, Ireland

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28 State Street
6th Floor
Boston, MA 02109 USA

TEL 1.617.531.4900

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15/F Plaza 66, Tower II
Nanjing West Road
Shanghai, China

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First Canadian Place
100 King Street West
Suite 4720
PO Box 147
Toronto, Ontario
M5X 1C7

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305 Church at North Hills Street
Suite 1101
Raleigh, NC 27609


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Our Investment Strategies

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