The mystery is solved. I contacted the reference librarian at Clemson. He found our man in an old year book and as luck would have it one of his relatives worked in the same building as he did. Several relatives have positively identified the photograph as William Henry GARRISON who was born in 1896 and died in 1964. As noted, he was a 1917 graduate of Clemson. His wife was Claire Steele from TN. He wasn't the Californian I had thought; but a scan of the photograph is available to any family members who have an interest.