Crowninshield worked in the family shipping business, Geo. Crowninshield & Sons, serving at sea. In 1811, Crowninshield was elected to the Massachusetts House of Representatives as a prominent benefactor of the first Gerrymander. The redistricting of Essex county into two separate State Senate districts had led to the term Gerrymander, with Crowninshield, who had lost the previous year's Senate seat in a combined Essex County, being placed in the new district specifically designed to favor Republicans over Federalists. Crowninshield would win his Senate seat by only 8 votes, over 100 votes less than the other Republican candidates. However, Crowninshield lost his seat in the State Senate the next year, with the Newburyport Herald printing an editorial cartoon of a dead Gerrymander and listing "B.W.C." as a "chief mourner." He was elected to the Massachusetts State Senate in 1812.
Crowninshield became Secretary of the Navy in January 1815, a position almost held by his brother Jacob Crowninshield ten years earlier, and managed the transition to a peacetime force in the years following the War of 1812. This included implementation of the new Board of Commissioners administrative system and the building of several ships of the line, the backbone of a much enhanced Navy. He also oversaw strategy and naval policy for the Second Barbary War in 1815.
After leaving Navy office in 1818, Crowninshield returned to business and political affairs in Massachusetts, prospering in both. In addition to serving two more terms in the Massachusetts House, he was also elected to four terms the United States Congress from 1823 to 1831.
Personal life
On January 1, 1804, Crowninshield was married to Mary Boardman, the daughter of Francis Boardman and Mary Boardman. Together, they were the parents of:
George Casper Crowninshield married Harriet Sears Crowninshield ; they were the parents of Frances "Fanny" Cadwalader Crowninshield, the wife of John Quincy Adams II.
Through his son Francis, he was the grandfather of Benjamin Williams Crowninshield, a soldier in the Civil War and merchant, and the great-grandfather of Bowdoin Bradlee Crowninshield, a naval architect who specialized in the design of racing yachts, and Francis Boardman Crowninshield, who married heiress Louise Evelina du Pont. Through his son Edward, Crowninshield was the grandfather of Frederic Crowninshield, the artist and author, and the great-grandfather of Francis Welch Crowninshield, the journalist, critic, and editor of Vanity Fair. Crowninshield was also the great-great-grandfather of Charles Francis Adams III, also Secretary of the Navy from 1929 to 1933. He was the great-great-great-grandfather of famed The Washington Post newspaper editor Ben Bradlee.
Namesake
The destroyer USS Crowninshield was named in his honor.
