On Monday,  April 6th, Brit Shields successfully defended her dissertation, 

"A Mathematical Life: Richard Courant, New York University, and Scientific Diplomacy in Twentieth Century America" (adviser is Susan Lindee)

and on Wednesday, April 8th, Rachel Elder successfully defended her dissertation, 
  
   "Secrecy & Safety: A Cultural History of Seizures in Mid-Twentieth Century America"
(adviser is Beth Linker).

Congratulations!