JBoss founder and former chief executive Marc Fleury has officially left Red Hat, the Linux distribution vendor that purchased his open-source middleware company for $350 million (£179.5m) in June 2006.

Fleury, who had been on paternity leave, will not be rejoining Red Hat, a company spokeswoman confirmed last Friday.

"I have done what I can to help Red Hat succeed," Fleury said in a statement released by Red Hat. He added that the open source movement has evolved well beyond the "force of individual personality".

For his part, Matthew Szulik, Red Hat's chief executive, praised Fleury's "positive contributions" to open source software. He said that the integration of JBoss with Red Hat was complete and "all functions are well managed".

There was no word on whether Red Hat would look to appoint a replacement for Fleury's position as senior vice president and general manager of its JBoss division. His duties included defining the application development strategy for the business unit.

Red Hat's purchase of JBoss last year was somewhat unexpected as rumours had previously circulated that database and applications vendor Oracle was set to gobble up the middleware player.

JBoss felt comfortable becoming part of Red Hat because the more established company was like a "big brother," Fleury said in April of last year, since the middleware startup modelled its subscription and services businesses on those of the Linux vendor. "It was very important to me to know that I was taking this company into an environment that was conflict-free where there could be trust," he added. For JBoss, being acquired was the way to accelerate the adoption of its middleware around the world using Red Hat's sales channels, Fleury said.

Before he founded JBoss, Fleury worked at Sun Microsystems on Java-enabling applications from SAP.