Who was the CEO of IBM when it introduced the System/360 mainframe in 1964?

Thomas J. Watson Jr. was IBM’s CEO when the company introduced the System/360 mainframe in 1964.

Watson Jr., IBM’s second chief executive, became CEO in 1956 and led the company until 1971. He pushed IBM decisively toward computing and backed System/360, announced on April 7, 1964. The project required an extraordinary investment—often described as a $5 billion “bet the company” gamble.

System/360 was revolutionary because it created a compatible family of computers spanning a wide range of performance levels. Customers could move from smaller to larger machines while preserving software compatibility, a major change from IBM’s fragmented product lines. The architecture also helped establish the eight-bit byte as a computing standard.

The main confusion is between Watson Jr. and his father, Thomas J. Watson Sr., who had led IBM before him and built its sales culture. Lou Gerstner and John Akers were much later IBM CEOs. System/360’s success helped make IBM the dominant force in corporate computing for decades.