Dan Fylstra

In 1975 Dan Fylstra was a founding associate editor of Byte magazine.

In 1978 he co-founded Personal Software (later VisiCorp), with  Peter R. Jennings.

Personal Software became the distributor of a new program called VisiCalc, the first-ever computer spreadsheet. In his marketing efforts Fylstra ran teaser ads in Byte that asked, considering electronic spreadsheets were an entirely new product category, "How did you ever do without it?"

The VisiCalc-Apple connection suggested the hypothesis of the "killer app"—or the "software tail that wags the hardware dog.“ Once VisiCalc caught on, people came into computer stores asking for VisiCalc and then also the computer (the Apple II) they would need to run the program. VisiCalc sales exceeded 700,000 units by 1983.

In 1981 and 1982 Fylstra's company, later called VisiCorp, was the #1 personal-computer software (exceeding Microsoft which became the largest such firm in 1983).

Fylstra is the former president of Sierra Sciences, and is currently president of software vendor Frontline Systems.