Before Bill Gates, There Was Roy L. Clay Sr.

The black Silicon Valley pioneer helped Hewlett-Packard design and build its first computers.

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To today's iPad generation, accustomed to lightweight portable computing power, the first computer Roy L. Clay Sr. helped build may seem like a relic.

When Clay, now 82, learned how to program computer code in 1956, Bill Gates was in diapers. Universities didn't have computer science programs. And a computer stable enough to run for a full day without failing was the holy grail.

David Packard, co-founder of Hewlett-Packard Co., brought Clay on board in 1965 to build that computer.

Packard heard about Clay from a friend who had worked on the Manhattan Project, the United States' answer to Germany's nuclear-development program during World War II. In 1958 Clay was a computer programmer at what is now Lawrence Livermore National Laboratory in California, turning the ethereal into something tangible: He wrote software that showed how particles of radiation would spread through the atmosphere after an atomic explosion.

What Packard had in mind were computers that would work with other instrumentation that HP built. He knew nothing about software.

"He trusted that to me," Clay said.

Clay was born in Kinloch, the oldest African-American community incorporated in Missouri. He lived in a home with no indoor plumbing, a neighborhood with no streetlights, in an area with a tradition of police picking up black boys like Clay if they wandered outside of Kinloch after dark.

"Everybody cared," Clay said of his hometown. His first teacher "inspired me to do well. By the time I left that little school, I thought I could learn to do anything."

Clay, a Saint Louis University graduate who majored in mathematics, continued to seize every opportunity that came his way. Through hard work, intellect and a bit of luck, not only would he eventually became CEO of his own company, but he would advise a venture capital superstar whose investments gave life to Silicon Valley start-ups, beginning with Tandem Computers.

Clay set up HP's computer-development business in an atmosphere conducive to creativity. His workers began the day by playing golf together at daybreak and filtered into HP around 9 a.m. They left when their work was done.

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