McKenna was an associate at Goodsill Anderson Quinn & Stifel until 1987, then served as general counsel to Otaka, Inc. until 1990. She became an assistant professor at the
University of Hawaii Law School before being appointed a
District Court judge on November 30, 1993. She was elevated to the
Circuit Courts on June 29, 1995. McKenna was one of three candidates recommended to President
Barack Obama by
Senators Daniel Inouye and
Daniel Akaka to fill a judicial vacancy on the
United States District Court for the District of Hawaii. Over one hundred pieces of testimony were submitted to the Judiciary Committee with respect to her nomination, the vast majority of which were supportive of McKenna. She was sworn in on March 3, 2011. She became acting chief justice upon the retirement of
Mark E. Recktenwald. ==Personal==