John H. Haessler, a founder of the Seafood Shop in Wainscott, died at home in East Hampton on Friday. He was 68. There will be no funeral service, but a memorial service will be held at a future date. His family has suggested donations in his memory to East End Hospice, P.O. Box 1048, Westhampton Beach 11978. An obituary will appear in a future issue.