Mitt Romney has returned to the private sector, taking on a role at an investment firm run by his son Tagg.


Tagg Romney with his parents after the New Hampshire primary, Tuesday, January 10, 2012. (Melina Mara/Washington Post)

Romney will serve part of the time as chairman of the executive committee at Solamere Capital, a source with knowledge of his plans confirms. A letter has gone out to investors announcing Romney's increased role.