Mr. Postich was born in Belgrade, Yugoslavia. He attended the University of Belgrade, earning a master's degree in electrical engineering in telecommunications and electronics. He immigrated to the United States at the age of 27.
In 1969 he met his future wife, Zlata. They were married in 1971 and built a home in Portola Valley.
A scientist and private pilot, Mr. Postich served as president of the Saint John's Serbian Orthodox Church board, vice president of the Serbian National Defense, member of the First Serbian Benevolent Society, the "Dusan Silni" Historical Society, and many other organizations.
He is survived by his mother-in-law Vera Solovkov, sons Mark and George, two grandchildren, and a niece and a nephew. His wife, Zlata, died in 2011. A private memorial gathering will be held in San Francisco.
Donations may be made in his memory to Saint John's Serbian Orthodox Church, 900 Baker St., San Francisco, CA 94115.