Dr. Jernegan was responsible for getting his parents to pen their memoirs. We would know a great deal less about their lives and adventures had he not encouraged them to do so. He became an expert on the whaling era, writing papers and giving enlightening talks. Marcus was also credited for making public his sister's journal from her time on board the Roman.

Marcus and his family spent summers at a camp built at Oakdale near Trapp's Pond in Edgartown. He died in 1949 at the age of 76 in Chicago, Illinois.

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Martha's Vineyard Museum