Mary Halvorson (born October 16, 1980) is an American avant-garde jazz guitarist from Brookline, Massachusetts. Among her many collaborations, she has: led a trio with John Hébert and Ches Smith, and a quintet with the addition of Jon Irabagon and Jonathan Finlayson; recorded duo albums with violist Jessica Pavone; and recorded several albums with bassist Michael Formanek and drummer Tomas Fujiwara under the band name Thumbscrew.
