A specialist in the design and manufacture of artillery pieces and ammunition, he attained the rank of temporary brigadier general.

He died at the Brattleboro Retreat on 1 March 1960 and was buried at Cimetière Mont-Royal in the Outremont borough of Montreal.

[1] Among his siblings was George Conrad Westervelt, a prominent United States Navy officer and aviation pioneer.

[13] In September 1906, he was promoted to temporary captain in the Ordnance Corps and was assigned to experiment with Field Artillery at Sandy Hook Proving Ground, New Jersey.

[13] In September 1906, he was appointed inspector of Ordnance at Philadelphia's Midvale Steel Works, followed by assignment as assistant to the commanding officer of the Rock Island Arsenal.

[13] From July 1908 to October 1910, Westervelt was assigned to field artillery production and inspection duties at Philadelphia's Frankford Arsenal.

[14] He was then appointed superintendent of the gun factory at the Watervliet Arsenal in New York, which was followed by assignment as executive officer at the Sandy Hook Proving Ground.

[15] From December 1916 to February 1917, Westervelt advised the technical staff at the International Arms and Fuse Company in Bloomfield, New Jersey.

[17] One of the Westervelt Board's recommendations evolved into the M2 105mm howitzer, and another into the 75mm antitank gun, both of which played important roles in US success during World War II.

[17] Westervelt returned to his permanent rank of major in July 1919 and was promoted to lieutenant colonel in September 1919.

[20][21] In the early 1930s, Westervelt took leave from Sears to accept government post as Director of processing and Marketing for the Agricultural Adjustment Administration.

[23] From August to November 1940, he was recalled to active duty for World War II and served on the staff of the Chief of Ordnance.

[29] In 1951, Westervelt began to experience health problems, and he moved to Burlington, Vermont to live near members of his family.