Larry Summers, the Harvard professor and former top financial advisor during the Obama administration, has cut ties with troubled crypto conglomerate Digital Currency Group (DCG). 

Summers joined DCG as a senior advisor in 2016, a year after DCG was formed. It’s not clear when Summers resigned his role — through a spokesperson, Summers told Protos he left DCG several months ago.

However, the former US Secretary of the Treasury was listed on DCG’s website as a member of the company’s advisory board as recently as November. That information has since been removed from DCG’s website.

Summers’ own personal website was updated on Wednesday, eliminating any mention of his six-and-a-half-year relationship with DCG from his bio – shortly after the professor and DCG were contacted by Protos for this article. A Summers spokesperson said that the professor’s resignation from DCG was part of a “scaling back of commitments,” but declined to detail what other positions Summers had also recently given up.