"Bob was a very respected leader. ... When I had a heart attack, I chose him to be my doctor," said Dr. Baker of Owings Mills.

"He was very competent and principled. He still visited patients; not many doctors to that today," said Dr. Baker.

Dr. Mason retired in 1986.

Dr. Mason traveled several times to Nepal. During his first trip, he worked at a Protestant missionary hospital with the staff.

On a subsequent visit, several young doctors accompanied him on a survey in northwestern Nepal to assess the health needs and report to the king of Nepal. Dr. Mason and his party discovered that due to a lack of iodine, thyroid problems were quite common.

Dr. Mason, who was an avid hiker, had climbed the Grand Tetons, the Matterhorn and Kilimanjaro. He and his wife also climbed 18,500 feet to a base camp on Mount Everest in Nepal.

When living on St. George's Road, Dr. Mason took up skiing and enjoyed instructing others in the activity.

"He took up skiing later in life but with gusto," his son said.

"In short time, he was an expert and built a 150-foot tow rope on our back hill in Roland Park complete with night lights and outdoor speakers playing Swiss mountain horn and yodeling music," he said.

Dr. Mason had been a Johns Hopkins Hospital trustee and an active member of Brown Memorial Woodbrook Presbyterian Church.

Dr. Mason, who had moved to Brightwood from Woodbrook in Baltimore County a decade ago, was an accomplished photographer and woodworker. He was also an avid golfer and member of the Elkridge Club.

A memorial service will be held at 11 a.m. Nov. 3 at Brown Memorial Woodbrook Presbyterian Church, 6200 N. Charles St.

In addition to his son, Dr. Mason is survived by his wife of 34 years, the former Beverly Mann; another son, Andrew H. Mason of Hollis, N.H.; a daughter, Elizabeth M. Baker of Columbia; four stepsons, U.S. District Judge Benson E. Legg of Roland Park, Christopher Legg of Ruxton, Bruce Matthai of Woodbrook, , and William Legg of Key Largo, Fla.; two stepdaughters, Beverly Ciccarone of Mount Washington and Anne Reigeluth of Harrison, N.Y.; and 30 grandchildren. An earlier marriage to the former Dr. Jane White ended in divorce. Another son, Robert E. Mason Jr., died in 2001.