Feel around the bottom of this aluminum-framed chair and you'll find no levers. Instead, there are two smart side panels that allow you to make adjustments while you're seated. The leather and mesh padding is meant to conform to workers' shapes and seat them more comfortably.
Dr. Aibinder says: "If you like a plush seat you sink into slightly, this is a good option. While it supports the upper back well, it lacks any serious lumbar support." [From $1,450; allsteeloffice.com]