Nunlist was elected president of Worthington in 1962, replacing Walter Feldman, who had been president from 1957 to 1962. Feldman became chairman. In 1965 Nunlist was appointed chief executive officer. In April 1967 he was elected chairman and chief executive officer at the age of 53, while Admiral (retired) Albert G. Mumma was appointed president and chief operating officer. In 1967 the entrepreneur
Derald Ruttenberg organized a merger of
Studebaker and
Worthington Corporation to form
Studebaker-Worthington. The merger was completed in November 1967, creating a company with $550 million of assets. The combined company included the profitable divisions from Studebaker, brake and electrical automobile component manufacturing from
Wagner Electric, and diverse operations from Worthington that included manufacture of construction equipment, valves and power generation plant. Frank J. Nunlist was appointed president and chief executive officer.
Randolph Guthrie of Studebaker was chairman of the new company. Nunlist was a member of the Business Advisory Committee for Nixon-Agnew in the 1968 presidential campaign. Nunlist resigned from Studebaker-Worthington effective 31 December 1968. It was reported that the cause was a dispute over the restructuring of the company proposed by Ruttenberg. In January 1969 the board of directors replaced Nunlist with Derald H. Ruttenberg as president and chief executive officer. ==Later career==