Darren Collier



(312) 382-3167

(312) 382-8910

Darren concentrates his practice on the state of Illinois and federal government relations, with a specific focus on lobbying the Illinois General Assembly in Springfield, Ill. With decades of experience in Illinois state government and in the private sector, he helps clients navigate a wide variety of public policy issues.

Prior to joining the Cozen O’Connor, Darren worked as the executive director of government affairs for the Chicago Mercantile Exchange (CME). Prior to his time at CME, he spent nine years assisting clients with government relations and lobbying at two AmLaw 100 law firms. He developed and managed a diverse client roster of Fortune 100 companies and assisted clients at both the state and federal level. 

Prior to his time in the private sector, Darren served as the deputy general counsel and director of legislative affairs for the Illinois Housing Development Authority. He also served as an executive assistant and policy aide for former Illinois Attorney General Jim Ryan.

Darren earned his bachelor's degree from Indiana University and his law degree from Capital University Law and Graduate Center.



Leading Lawyers Network Recognizes 26 Cozen O’Connor Lawyers as Top Illinois Practitioners

January 26, 2021

The Leading Lawyers Network has named 24 Cozen O’Connor lawyers to its annual list of Illinois’ top practitioners and named two others as Emerging Lawyers in its 2021 survey results.

Making the Push

February 03, 2020

In its January 2020 edition, the Chicago Lawyer magazine highlights the work of the Chicago office of Cozen O’Connor Public Strategies, particularly Darren Collier’s efforts to shape the 2020 legislative agenda.

Cozen O'Connor Adds Three Lobbyists in Chicago

September 19, 2019

Cozen O'Connor welcomes three new lobbyists, John F. Dunn, Darren Collier, and Patrick L. Carey to the Public Strategies practice in Chicago.

Cozen O’Connor Public Strategies Continues its National Expansion, Adding John F. Dunn, Darren Collier, and Patrick L. Carey to Growing City of Chicago and State of Illinois Practice

September 04, 2019

Cozen O’Connor cements its top-tier lobbying presence in three of the largest cities in the United States — Chicago, Philadelphia, and New York — and the corresponding state capitals.


Indiana University’s Alumni in Action: Darren Collier

February 26, 2021

Darren Collier (BA’90), a Chicago-based member of Cozen O’Connor Public Strategies, has been profiled by his Alma Mater Indiana University’s O'Neill School of Public and Environmental Affairs.


  • Capital University Law and Graduate Center, J.D., 1994
  • Indiana University–Bloomington, B.A., 1990