Mr. Miller received a bachelor's degree in mechanical engineering from the University of Virginia in 1969. There he played varsity lacrosse, sang with the glee club and was a member of Tau Kappa Epsilon fraternity.
In 1973, he and an uncle established C&D Corp., a family-owned business that he expanded from a single carwash and gas station to multiple locations. He had not retired at his death.
The care that his daughter received at the Johns Hopkins Children's Center in the first few months of her life inspired Mr. Miller to raise money for the center.
According to Johns Hopkins officials, Mr. Miller raised $1.8 million for the children's center over the past 30 years.
Since his death, Mr. Miller's family has established the Doug Miller Family Fund, proceeds of which will be used for pediatrics training, clinical care and research.