Capt. Greg Cunningham died unexpectedly Jan. 17 at his home in Ocean Ridge, Fla. He was 64.

Capt. Cunningham was skipper on the M/Y Seaquest program for 18 years where he ran, designed, built, and managed the owners’ fleet, starting with a 65-foot Hatteras, moving up to an 82-foot Hatteras convertible, and then to a 90-foot custom Hatteras. His last command was a 112-foot Westport.

In his youth, Capt. Cunningham spent summers on Cape Cod learning to race Beetle Cats and Wianno Seniors, eventually working on commercial fishing boats and ferries out of Hyannis, Mass. He enrolled in Massachusetts Maritime Academy and served a short stint in the U.S. Merchant Marine. 

He graduated magna cum laude from the Carroll School of Management at Boston College, and worked for a time in the insurance industry in Boston.

But the sea continued to beckon and he moved to the Caribbean to enjoy a more nautical life as a charter captain. Capt. Cunningham rebuilt a 30-foot sloop and spent three years circumnavigating the globe under sail. He then began to focus on a career in the yacht design, management and sales industry. 

Most recently, Capt. Cunningham worked as a broker in South Florida, first with Dwight Tracy and Friends and then with Westport, spending as much time as possible with his son.

Capt. Cunningham is survived by his son, Gregory J. Cunningham Jr. of Boynton Beach, Fla., and his nephew, Edward A. Cunningham IV of Boston. Arrangements for a memorial service are being scheduled for a later date.