Timothy M. Zimmerman is a senior associate in the Denver office of Gibson, Dunn & Crutcher.  He practices in the firm’s litigation department, focusing on investigations and regulatory issues, including SEC and PCAOB Enforcement, Antitrust, and Consumer Protection matters.  Some of Mr. Zimmerman’s recent matters include representation of:

SEC and PCAOB Enforcement

• Lynn Tilton and her company, Patriarch Partners, against SEC fraud charges over her management of a distressed debt CLO fund, culminating in a three-week administrative proceeding that resulted in a complete victory for Ms. Tilton;
• A Big Four accounting firm and employee auditors in an SEC investigation and administrative proceeding involving an audit in the financial services industry during the financial crisis, including successful appellate representation before the Commission and Eighth Circuit Court of Appeals; and
• Multiple public companies and audit firms in SEC and PCAOB investigations regarding public disclosures involving accounting, executive compensation, and other personnel matters. These matters span multiple industries including IT consulting, banking and investment, retail sales, and for-profit education.

Antitrust and Consumer Protection

• Multiple public companies involved in merger review before the DOJ and FTC, focusing primarily on healthcare, energy, and manufacturing matters; and
• Defending public companies in FTC investigations involving allegations of deceptive advertising and marketing claims, Clayton Act violations, and inadequate responses to data breaches.

Mr. Zimmerman maintains an active pro bono practice, focusing on both federal and state appellate matters.  He has twice received the Firm’s Frank Wheat Award for excellence in pro bono service.  Recently he participated in the following pro bono engagements:

• Serving as lead counsel in an immigration appeal in the Seventh Circuit Court of Appeals for a non-citizen from Belarus facing proceedings to exclude him from the US. After Mr. Zimmerman delivered oral argument, the Seventh Circuit published a unanimous opinion in the client’s favor – Ruderman v. Whitaker, 914 F.3d 567 (7th Cir. 2019);
• Representing a non-profit in a promissory estoppel case against the City and County of Denver, in which Mr. Zimmerman and his colleagues successfully pursued summary judgment and subsequent appellate proceedings, including a successful grant of certiorari to the Colorado Supreme Court, and a favorable ruling from the same;
• Representing a Colorado state prisoner, who is also a Canadian citizen, in a successful appeal to the Colorado Court of Appeals after the Department of Corrections incorrectly applied its own administrative regulations regarding prisoner transfer to Canada; and
• Representation of a single mother in a parenting time dispute before the Colorado Court of Appeals.

Mr. Zimmerman also serves as the State Vice-President for Colorado of the Tenth Circuit Historical Society, which works to preserve and promote knowledge of the history of the development of the law in the Tenth Circuit and the judges and notable lawyers who have served in the Circuit.  Mr. Zimmerman is active in the Society and has contributed to several Society publications over the years.  Additionally, Mr. Zimmerman formerly served as the Chair of the Antitrust Subcommittee of the Business Law Subsection of the Colorado Bar Association.

Mr. Zimmerman earned his law degree from The University of Chicago Law School in 2010, and his Bachelor of Arts in Political Science from The Ohio State University in 2005.  Before joining Gibson Dunn, Mr. Zimmerman clerked for the Honorable Timothy M. Tymkovich of the United States Court of Appeals for the Tenth Circuit from 2011 to 2012, and for the Honorable Allison H. Eid of the Colorado Supreme Court from 2010 to 2011.

Mr. Zimmerman is registered to practice law in the state of Colorado, as well as in the United States Courts of Appeals for the Seventh Circuit and Tenth Circuit.  Mr. Zimmerman also serves as an adjunct professor at the University of Wyoming College of Law.