Pat Sullivan started Contact Software in Dallas, Texas in 1986. With his friend Mike Muhney and two programmers, Randy Haben and John Maurer, the team developed the first commercial version of the contact manager ACT!. In 1993, ACT! was acquired by Symantec. In 1995, Pat Sullivan founded the sales automation company SalesLogix. In 1999, SalesLogix Corp was renamed to Interact Commerce Corporation and ACT! was reacquired from Symantec. In May 2001, Sage Group plc acquired Interact Commerce Corporation
In 2005, Pat Sullivan launched Jigsaw Health and published the book Wellness piece by piece in an effort to help the 125 million Americans suffering from chronic health conditions.