Mr. Garratt died Nov. 21 at his home in San Martin, relatives said. He was 64.
Mr. Garratt grew up in San Mateo and loved to build and take things apart, relatives said. In high school, he found ice hockey and played competitively all his life.
Among his interests: river rafting, creek walking, surfing, skiing from helicopters, parachuting from airplanes, and riding motorcycles on two continents, relatives said.
"He had a laid back but adventurous spirit," relatives said. "Gary made people feel comfortable around him and always had a big smile for everybody."
Mr. Garratt built a Woodside home for his wife and two boys and went on to build and fly airplanes, relatives said. His San Martin home included a shop suitable for airplane construction.
Mr. Garratt received a bachelor's degree in economics in 1970 from the University of Denver, relatives said. He stayed in Colorado, built homes and became noteworthy as a high-yield wheat farmer.
He moved to the Bay Area in 1978 to work at Garratt-Callahan Corp., a water treatment equipment supplier started by his grandfather and based in Burlingame with offices around the country. Mr. Garratt was chief financial officer and a member of the company's board, relatives said.
As an entrepreneur, Mr. Garratt founded three power plants run on hydroelectricity and/or methane, relatives said.
Mr. Garratt is survived by his mother Phyllis, his brothers Peter and Robert; his daughter Jenny; his son Tyler; grandchildren; and "special friend" Mary Ellen Carlin, relatives said.
Go to tinyurl.com/Garratt-193 for more information and to leave remembrances on the Almanac's Lasting Memories website.