Harold Taylor Wood Grant CBE DSO CD was born at Halifax Nova Scotia, son of Lieutenant Governor MacCallum Grant and Mrs. Grant. In 1914 he entered the Royal Naval College of Canada at Halifax and graduated in December 1916.

His first sea appointment during WWI was in February 1917 as a midshipman with HMS Leviathan. Much of his service after WWI and before 1931, when he was appointed to the newly acquired Canadian destroyer Saguenay, was on board ships of the Royal Navy.

In 1938 Grant was appointed commanding officer of the destroyer HMCS Skeena and was in command during the 1939 visit to Canada by the King and Queen. In March 1943, Grant was appointed in command of the Royal Navy Cruiser HMS Diomede and later commanded HMS Enterprise.

For his part in a Bay of Biscay action on 28 December 1943, Grant was awarded the Distinguished Service Order (DSO), for "gallantry and skill and good service in command of HMS Enterprise in an action with enemy destroyers".

While commanding the Enterprise, she and a sister ship, the Glasgow, took on a fleet of 11 enemy destroyers. The two cruisers sank three, damaged several, and chased the remainder into a French port. For his service during the D-Day, June 1944 invasion of Normandy, Grant was "Mentioned in Despatches".

The USA awarded Grant the Bronze Star for his action during the naval bombardment of Cherbourg France, where he was wounded. In September 1947 Vice Admiral Grant was appointed Chief of Naval Staff in Ottawa and held that post until his retirement at the end of 1950.

On 8 May 1965, Vice Admiral Grant passed away suddenly at his home in Ottawa (Rockcliffe). He was survived by his wife and two daughters (Sarah Grant and Mrs. Caroline Gill) and one son (John MacGregor Grant).