 Prior to joining Pierce Atwood in 1952, McKusick served successively as law clerk to Chief Judge Learned Hand of the United States Court of Appeals for the Second Circuit and to Justice Felix Frankfurter of the United States Supreme Court.From 1943 to 1946, he served in the U.S. Army, in part in Los Alamos, New Mexico, participating in the Manhattan Project.McKusick received his A.B.