EW - The actor joined the show’s eighth year after his brief turn in the show’s seventh season finale. Spader played Dunder Mifflin’s quirky confident CEO Robert California, stepping in after star Steve Carell’s departed the series.
I've always liked James Spader and he was just awesome on Boston Legal but I don't think he fit in on that show as much. I really miss him and William Shatner on Boston Legal sometimes.
He hasn't been on the last three episodes I think, and he was just starting to get funny too.