There was a time when Jonathan Schwartz was one of the most prominent CEOs in the IT industry. The pony-tailed executive was largely credited with helping to lead Sun Microsystems to prominence, but more recently he has been residing in Silicon Valley's 'Where are they now?' file.

After leaving Sun by way of a poem and taking flak from Larry Ellison, Schwartz has been flying under the radar for the most part.

Now, it seems he is back in the saddle. Enterprise collaboration and communications firm Moxie Software has announced that Schwartz will be joining its board of directors. The former Sun chief will help to guide the firm, which sells employee collaboration tools and shared workspace platforms.

"The social enterprise software market is in its infancy, and will undoubtedly grow as companies embrace collaborative interactions with all their constituencies," Schwartz said of his new company.

"Moxie Software is well positioned to lead the market as Spaces by Moxie combines the best of social networking technology with the security and scalability required by enterprises."