There have been five different heads of the IRS this year alone: Doug O'Donnell (Jan. 20th thru Feb. 28th) Melanie Krause (Feb. 28th thru April 16th) Gary Shapley (April 16th thru April 18th) Michael Faulkender (April 18th thru June 16th) Billy Long (June 16th thru today) About to be a sixth.