Al Kooper, by rights, should be regarded as one of the giants of ’60s rock, not far behind the likes of Bob Dylan and Paul Simon in importance. …. he was a very audible sessionman on some of the most important records of mid-decade, including Bob Dylan’s “Like a Rolling Stone.” Kooper also joined and led, and then lost two major groups, the Blues Project and Blood, Sweat & Tears. He played on two classic blues-rock albums in conjunction with his friend Mike Bloomfield. As a producer at Columbia, he signed the British invasion act the Zombies just in time for them to complete the best LP in their entire history; and still later, Kooper discovered Lynyrd Skynyrd and produced their best work.
~Bruce Eder (allmusic.com)
Al Kooper Tribute: