Conversation so far:
What was his role in sports?
Ballmer made a "game changing" commitment to invest $150 million in cash toward a proposed $300 million renovation of KeyArena.
Did he purchase a team as well?
were ready to purchase the Seattle SuperSonics from the Professional Basketball Club LLC in order to keep the team in Seattle.
What year was this in?
On March 6, 2008.
Did he do anything else in Seattle?
In June 2012, Ballmer was an investor in Chris R.
Hansen's proposal to build a new arena in the SoDo neighborhood of Seattle and bring the SuperSonics back to Seattle.
Did he try to invest in other teams?
Following the Donald Sterling scandal in May 2014, Ballmer was the highest bidder in an attempt to purchase the Los Angeles Clippers for a reported price of $2 billion.
Did he actually mange to purchase the team?
it was officially announced on August 12, 2014 that Ballmer would become the Los Angeles Clippers owner.

Question: Who did he buy it from?
Self-contained rewrite: Who did Steve Ballmer buy the L.A. Clippers from?