I'm still getting caught up on my Timothy Leary education. By contrast, Oz Fritz already knows a lot about Leary, and he recommends the new, free Timothy Leary book, Timothy Leary's Trip Through Time by R.U. Sirius (free download is here.)
Oz has a long, thoughtful review at his blog. Oz thinks Sirius' book is an ideal introduction for people who little nothing about Leary aside from the media caricature of Leary as a drug-addled clown. But it's also for well-informed Leary fans, says Oz, who cites specific bits of the book that surprised and pleased him. (Oz has read the other two Leary bios and also apparently has read all of Leary's books that provide biographical information.)
Sample quote from Oz's review: "All of the bases are covered here. However, to flesh out the picture, I highly recommend reading the other two biographies, as well. I Have America Surrounded by John Higgs gives a sympathetic, sometimes empathic presentation of Leary's life without shying away from some of the darker aspects. Timothy Leary: A Biography by Robert Greenfield, though also well written, often comes across as a butcherous hack job by someone who clearly appears jealous and envious of his subject and so feels the need to put him down as much as possible. It reminds me of John Symond's biography of Aleister Crowley, The Great Beast. Yet, Greenfield's bio has much useful material when sifting out his bias. Toward the end of TLTTT Sirius accurately points out the flaws in Greenfield's book but also acknowledges his debt to it."