The notes below are likely full of typos.
Lecture notes for seminars given at CMU aimed at a general graduate student audience on the subjects of forcing, large cardinals and trees.
Four talks given at CMU on Mitchell's forcing to get the tree property at $\aleph_2$. Talk 1, Talk 2, Talk 3, Talk 4.
Three talks given at CMU on PCF theory Talk 1, Talk 2, Talk 3.