Listed in The Best Lawyers in America since 2000, Diane’s practice focuses on complex litigation and dispute resolution. 

Prior to joining the firm in 1978, she was an extern to the Honorable Herbert Choy, Circuit Judge, Ninth Circuit Court of Appeals. 

Diane also is involved in a number of professional and civic community activities, servicing on the Disciplinary Board of the Hawaii Supreme Court, as a national director of Easter Seals, and the Easter Seals Foundation, as well as a director for Easter Seals Hawaii, and as a director of Aloha United Way, among others.  An avid golfer, Diane is married to Mark H. Hastert.  Their daughters, Shanna Kathleen Williams and Hallet Anne Smith, live in Naples, New York and Alexandria, Virginia, respectively.

Professional & Community Affiliations

● Adjunct Professor, William S. Richardson School of Law (Appellate Advocacy, 1989)
● Advisory Committee to the American Institute of Architects/RUDAT (1974-75)
● Aloha United Way (Director 2005-present)
● Alternative Economic Futures for Hawaii (Commerce Task Force 1973-74)
● American Bar Association (Host Committee 1989)
● Board of Bar Examiners, Hawaii Supreme Court (1992-present)
● Civil Justice Reform Act Advisory Committee for the United States District Court for the District of Hawaii (Vice-chair)
● Citizens' Advisory Commission to the Capitol District (1973-74)
● Committee Supporting Federal Judicial Independence (2000-present)
● Disciplinary Board of the Hawaii Supreme Court (Member 2002-present)
● Disciplinary Board Hearing Officer (1990-2002)
● Easter Seals Hawaii (President 1993-95 & Director 1989-2002; 2004-present) (President’s Award 2004, Laulima Award 2003, Chairman’s Award 1993; Chairman’s Award 2004)
● Easter Seals Hawaii Foundation (Founding Director; President 2001-2003; Chairman 2003-present)
● Federal Magistrate Merit Selection Panel (1987; 1999)
● Friends of the William S. Richardson School of Law (Director 2004-present)
● Goodwill Industries of Hawaii, Inc. (Director 1980-91)
● Hawaii Defense Lawyers Association (Director, Secretary/Treasurer 1994-present)
● Hawaii Institute for Continuing Legal Education (Director, 1987-94; Seminar Instructor)
● Hawaii Judicial Foresight Congress (1991)
● Hawaii State Bar Association (Secretary 1987; Director 1985-89)
● Hawaii Supreme Court Committee on Code of Judicial Conduct (1991-93)
● Hawaii Supreme Court Committee on Model Rules of Professional Conduct (1989-94)
● Hawaii Supreme Court Committee on Professionalism (1989)
● Hawaii Theatre Center (Director 1989-1994)
● Hawaii Women Lawyers
● Hawaii Women's Legal Foundation (1993-present)
● Hawaiian Humane Society (Director 1995-2002)
● Junior League of Honolulu
● League of Women Voters (President 1973-75)
● Meritas (Founding Director; Vice-Chair 1999-2002)
● Oahu Traffic Safety Council (1986-90)
● Oahu Development Conference (1980-86)
● Ninth Circuit Judicial Conference (Appointed Hawaii Delegate 1985-88; 1997-2000)
● Ninth Circuit Senior Advisory Selection Panel (Appointee 1988-92)
● The Best Lawyers in America (listed 2001-present)
● United States District Court Judicial Conference (Delegate 1990-2003)
● United States District Court Local Rules Committee (Appointee 1988-95)
● United States District Court Panel for Review of Criminal Justice Act Panel Fees & Costs, Lawyer Representative for District, Panel Member (1999-2000)
● William S. Richardson School of Law Alumni Association (Director 2004-present)