Brian Harrison, the chief executive of Solyndra – the solar energy firm that filed for bankruptcy last month after receiving a $528 million federal loan – has stepped down in the wake of multiple investigations into the company that threaten to tarnish the White House.

Harrison, who was among the company’s top executives to plead the Fifth repeatedly during a congressional hearing last month, “left the company as scheduled” last Friday, Solyndra reported in a bankruptcy court document filed late Tuesday and obtained by But the document didn’t offer more details on his departure and a Solyndra spokesman could not be reached for comment.