Nicole Callan

Senior Associate


Nicole Callan is a senior associate who focuses on antitrust and competition matters, including merger clearance, civil litigation and criminal investigations. Ms. Callan has assisted clients in obtaining merger clearance from the Department of Justice, the Federal Trade Commission and the European Commission. She also has experience representing clients in civil litigation matters involving state and federal antitrust law claims.  Her clients include companies in the energy, entertainment, telecommunications, maritime, aviation, automotive and financial services industries.

Ms. Callan maintains an active pro bono practice, including asylum and veterans' rights actions.

While pursuing her legal education, Ms. Callan served as a judicial intern for the Honorable Beryl A. Howell of the US District Court for the District of Columbia. Prior to entering law school, Ms. Callan served as a special assistant at the Consumer Financial Protection Bureau and as an assistant to Chair Elizabeth Warren at the Congressional Oversight Panel for the Troubled Asset Relief Program. She also interned in the office of Senator Hillary Rodham Clinton.

Publications & News


February 14, 2018

Senior EU Court Adviser Provides Welcome Guidance on Gun-Jumping

EU and US laws prohibit merging companies from implementing reportable transactions until their deal is cleared or the statutory waiting period has expired.

August 10, 2017

DC Lawyers Support Record-Breaking Legal Aid Fundraising Campaign

Lawyers in WilmerHale's Washington DC office raised $135,000 for the Legal Aid Society of the District of Columbia's annual Generous Associates Campaign, a fundraiser run by associates at DC law firms each summer.

April 7, 2017

A Hitchhiker’s Guide to Antitrust and Intellectual Property Guidelines

In this article, published in the American Bar Association's Antitrust, Vol. 31, No. 2, Spring 2017 edition, authors Hartmut Schneider, Sarah Licht, and Nicole Callan discuss common principals between Antitrust and IP, "Secondary Guidance" and practice developments.

October 27, 2016

Energy Sector Alert Series: Antitrust and Acquisition of Partial Ownership Interests—What Energy Companies Should Know

Antitrust enforcers are increasingly scrutinizing transactions that result in partial ownership in competitors. This interest in partial acquisitions is particularly relevant in the energy sector, where the costs for developing large energy projects are high, and partial ownership can be used to spread risk and limit exposure.

May 1, 2016

Antitrust and Intellectual Property Guidelines: The “Common Core” And Beyond

Hartmut Schneider, Sarah Licht and Nicole Callan explore a "common core" of antitrust and IP principles that are addressed in many of the major IP/antitrust guidelines in this newsletter published by the American Bar Association Section of Antitrust Law Intellectual Property Committee.

April 1, 2015

Antitrust Liability for Product Hopping: A Look at Recent Decisions

In this article published in the Spring 2015 edition of Public Domain, the ABA Section of Antitrust Law Intellectual Property Committee newsletter, Nicole Callan discusses "product hopping," a practice in which brand manufacturers launch a new version of a successful drug before generic drug companies can enter the market with generic versions.

Community Involvement

Ms. Callan serves on the community leadership council for Make-A-Wish Mid-Atlantic and as a member of the Junior League of Washington. In 2017, Ms. Callan served as a co-chair of the Generous Associates Campaign for the Legal Aid Society of the District of Columbia.

Professional Activities

Ms. Callan is a co-editor for Public Domain, a quarterly newsletter distributed by the Intellectual Property Committee of the American Bar Association's Antitrust Section.


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JD, magna cum laude, Georgetown University Law Center, 2014, Order of the Coif, Executive Articles Editor, Georgetown Law Journal

BA, magna cum laude, New York University, 2009, Phi Beta Kappa

Bar Admissions

District of Columbia

New York

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