Caplin's contributions were recognized by numerous organizations over many years. The University of Virginia presented him the Supreme Court Justice William J. Brennan Jr. Award from its National Advocacy Program as well as the
Thomas Jefferson Medal in Law, the university's highest honor. Caplin also received an honorary Doctor of Laws from
Washington College in Chestertown, Maryland. The American Bar Foundation honored him at the
National World War II Museum in New Orleans founded by historian and author,
Stephen Ambrose. He was also named "Chevalier" of the
Légion d'honneur or Legion of Honor by the
President of the French Republic for his contributions to the United States' decisive role in the liberation of
France during
World War II. The
Maryland General Assembly issued an official citation in recognition of his appointment as "Chevalier" of the Legion of Honor. Caplin was the star middleweight of a national championship boxing team as a University of Virginia undergraduate in the mid-1930s. He also received the Medal of the Jubilee of Liberty, which was authorized by the Governor of the Normandy Region. On leaving the U.S. government, he received the
Alexander Hamilton Award, the highest award conferred by the
Secretary of the Treasury for his "distinguished leadership". He was also the recipient of the Achievement Award, Tax Society of
New York University; Judge Learned Hand Human Relations Award,
American Jewish Committee;
Tax Executives Institute Distinguished Service Award; The
Federal Bar Association's Kenneth S. Liles Award; The Miller Center of Public Affairs' Elizabeth Scott Award; Veterans of Foreign Wars Public Service Award; Virginia State Bar and Award. He was granted
Professor Emeritus from the University of Virginia, after having served as Professor of Law (1950–1961) and Visiting Professor of Law (1965–1987). He was a member of
Phi Beta Kappa and
Omicron Delta Kappa at the University of Virginia. Caplin was listed in the 2010 edition of The Best Lawyers in America in the specialty of Tax Law. Also, the Miller Center of Public Affairs hosted a prominent economic conference called the Mortimer Caplin Conference on the World Economy on December 10–11, 2009. Since its inception in 2008, the conference brings together leading experts to examine crucial economic issues on the global stage. He was also selected for the Veterans History Project, which preserves and presents personal accounts of American veterans in order to help future generations to better understand the realities of war. ==Family life and death==