Rohmer, who completed his legal studies at Osgoode Hall Law School, was called to the Bar in 1951, appointed Queen's Counsel in 1960, and currently holds "not practicing law" status with the Law Society of Ontario. He was chairman of the 60th anniversary of D-Day celebrations that took place in the presence of the Queen at Juno Beach in Normandy on 6 June 2004. As ministerial advisor to the Minister of Veterans Affairs he took part in the planning, preparation and execution of the government's celebration of the 70th Anniversary of D-Day at Juno Beach, France, on 6 June 2014, and was similarly engaged in the plans for the in-Holland Canadian celebration of the 70th Anniversary of the Liberation of the Netherlands on 5 May 2015. He is now one of the very surviving Canadian veterans of both of those Battles (Normandy and Holland).