Larry Summers is stepping back from his teaching duties at Harvard University amid an investigation into his connections with convicted sex offender Jeffrey Epstein.Harvard has reopened its investigation into Summers' ties with Epstein after emails revealed Epstein visited Harvard's campus over 40 times post-conviction.Harvard students and Senator Elizabeth Warren have expressed concerns about Summers' judgment and urged the university to sever ties while Summers takes a leave from multiple advisory boards and teaching roles.