Background
Blair was the son of Helen Hadduck (Bowen) and William M. Blair, who co-founded the investment banking firm William Blair & Company.
Blair was the son of Helen Hadduck (Bowen) and William M. Blair, who co-founded the investment banking firm William Blair & Company.
He graduated from the Groton School and took his undergraduate degree from Stanford University.
Deeda Blair was named director and vice-president of the Lasker Foundation in 1965 and is a noted advocate for public health issues. The Blairs had one child, William McCormick Blair 3rd (1962–2004), who was bipolar and committed suicide in 2004. to New York City. Blair died on August 29, 2015 at his home in Manhattan at the age of 98.