[citation needed] On October 15, 1994, Treanor married Allison Derivaux Ames, who was then director of strategic planning for corporate publicity and special events at Saks Fifth Avenue in New York City.

[citation needed] In 1998, he went on leave from the university to serve as deputy assistant attorney general in the Justice Department's Office of Legal Counsel, before he returned to assume his current position in 2002.

[5][dead link‍] On July 17, 2006, Treanor announced to students and faculty that the school surpassed the $20 million mark for new gifts and pledges.

[6][dead link‍] Plans for a new skyscraper were unveiled to accommodate increasing enrollment numbers, and the school ranks fifth in the country in placing its graduates at top-shelf law firms.

[8] In a 2006 interview, Treanor reported instituting free cupcakes and ice cream to alleviate the intensity of law school finals.

[9] Since Treanor's arrival, Georgetown Law has expanded the number of certified experiential offerings from 450 to more than 2000 seats and created four new clinics.

[10] During Treanor's tenure, Georgetown Law established a new program of post-graduate fellowships, which offer intensive training and opportunities for graduates to start public service careers.

Treanor has been cited in Supreme Court opinions twice, including by Chief Justice William Rehnquist in his dissent in Tahoe-Sierra Preservation Council, Inc. v. Tahoe Regional Planning Agency.

On June 6, 2006, he debated prominent classical liberal/libertarian law professor and published author Richard Epstein on the topic "Did Progressives Rewrite the Constitution?"