- Robert Rubin, as Treasury Secretary under Clinton, blocked regulation of derivatives in 1997, then negotiated the repeal of the Glass-Steagal Act in 1999, making Citigroup one of the largest financial instutions in the World. Three months later he joined Citigroup's Management. http://www.nytimes.com/1999/10/27/business/former-treasury-secretary-joins-leadership-triangle-at-citigroup.html?scp=19&sq=glass%20steagall&st=nyt&pagewanted=1 35 comments business