His dad, or possibly a friend or someone he looks up to? It could be anyone...
Or it could just be a picture of the late M.A. Douglas
http://give.uci.edu/recognition/gifts/douglas-the-ocs-new-name-in-healthcare.php
"Douglas was known for his business acumen and real estate partnerships that helped develop Orange County. While he traveled the world late in life, he spent his early years living with his family in Colorado in a tiny dirt-floored home built from railroad ties. When he was 6, his family worked as migrant laborers on the West Coast before settling in Oregon. Douglas left home at 14 and headed to Los Angeles, where he pursued his career at B.F. Goodrich.
In 1963, Douglas founded IPS which developed, built and managed more than 10,000 apartment units, primarily in Orange County. His office was just a few blocks from the hospital that now bears his name."
Or it could just be a picture of the late M.A. Douglas
http://give.uci.edu/recognition/gifts/douglas-the-ocs-new-name-in-healthcare.php
"Douglas was known for his business acumen and real estate partnerships that helped develop Orange County. While he traveled the world late in life, he spent his early years living with his family in Colorado in a tiny dirt-floored home built from railroad ties. When he was 6, his family worked as migrant laborers on the West Coast before settling in Oregon. Douglas left home at 14 and headed to Los Angeles, where he pursued his career at B.F. Goodrich.
In 1963, Douglas founded IPS which developed, built and managed more than 10,000 apartment units, primarily in Orange County. His office was just a few blocks from the hospital that now bears his name."
He does bear a striking resemblance to the photo in the OP. Maybe they are related?