C.A. (Clancy) Isaac, founder of the “Block O” tradition at Ohio State football games passed away Friday at the age of 78. In Isaac’s senior year he served as head cheerleader for the Buckeyes and thought of the idea for “Block O” after seeing a USC student organized cheering section. “He said if they can do it we can do it,” said his son Chip Isaac.Even after his graduation (1939) Isaac came back every year through 1978 during homecoming to lead a cheer. In 1978, while he led a cheer during halftime, the band spelled out his name on the field.”OSU was a very important part of his life,” Chip said.Isaac was still active in Block O and attended Block O meetings regularly, he said.Isaac was a marketing executive in New York for 34 years. He was the founder of Marketing Complex Inc. which is a company that developed marketing, advertising and promotional plans for major corporations.He also served as a major in the United States army during World War II.Isaac is survived by three children; Nancy, Jeannette, and Chip; two grandchildren Matthew and Daniel; and his companion Cheryl Durley.Contributions, in lieu of flowers, can be made in his honor to the Clancy Isaac scholarship fund. For more information, call 292-9369.