Following service in the
United States Army, Johnson became a research analyst at Fidelity Investments in 1957, the company founded by his father in 1949. He later became the portfolio manager for the Fidelity Trend Fund in 1960, and ran the famous
Fidelity Magellan Fund from 1963 to 1977. He then became president of the company in 1972, and chairman and CEO in 1977. Johnson was the first to begin the practice of permitting check writing on money market funds. He was also the first to sell discount
brokerage services to banks, insurance companies, and consumers. He supported and invested in automation of brokerage sales and operations. In a November 2016, memo to Fidelity employees, Johnson announced he would retire in December and turn over the chairmanship to his daughter Abigail. Although he would no longer be a member of the board of directors, Johnson planned to "maintain office hours ... and continue to consult periodically with Abby." == Society memberships, awards, and honors ==