In 1977 bought a home for his family in Atherton, CA for $150,000. Today Atherton, CA is one of the most expensive areas in the United States to purchase real estate.
Was a successful analyst with Dean Witter and was consulted where to invest the company's finances. He was mentioned in The Economist publication regarding his expertise on technology stocks just before his death as the industry was leading into the semi-conductor / Silicon Valley economic boom in the 1980's.
He was known by his friends and colleagues as "The Man with a Heart of Gold".
His wife Carol was six months pregnant with a boy to be named Matthew David when she died. Mark and Carol were killed while driving during a 100 year storm just miles south of Hilo, Hawaii while on vacation in March 1980.
Among the items found in the storm's aftermath and sprawl was an FBI card which matched the fingerprints of Mark Sr.
Mark provided the information and knowledge to propel the manufacturing of semiconductors which is now known as the integral component that transmits and transfers electricity from one source to another.