 To date, he is the last incumbent New Jersey congressman to lose in a non-redistricting primary election.After leaving Congress, he was administrative vice president of the Hun School, engaged in administrative education and project development, and worked at the Medical and General Reference Library of the Veterans Administration in Washington, D.C. from 1962-1973.Sieminski was a resident of Vienna, Virginia, until his death on December 13, 1990, at the age of 79 due to a heart attack.