Sewall’s love for the ocean first began when he was in grade school lobstering with his uncle Earl Brewer Sr. In 1977 he made his first trip on a trawler fishing with Richard McLellan on the Sea Bring. He later became captain at 19 on the 82-foot Irene’s Way, which was built for Richard at Goudy and Stevens in East Boothbay.
In the early 80s, Sewall started to captain for F. J. O’Hara and Son’s out of Rockland, Maine.