Acuity desk chair by Allsteel

"the folks at Allsteel are serious about workplace comfort. Acuity boasts no less than 14 ergonomically appealing qualities (high upper backrest, enhanced lumbar curve, and greater seat-height range most especially suit my unique pathologies) and seven adjustable features. But beyond the overt fine-tuning, the chair acts as if it has a brain; that is, non-adjustable features such as initial lumbar height, backframe flexion, and viscoelastic seat foam are ergonomically correct for every body (or at least for 95% of bodies). Thus the chair 'gets you started' in a sense, by already being tuned in to your unique contours, or, as Allsteel’s able PR folk have it: 'Ergonomics that work seamlessly, controls that work intuitively, posture maintained invisibly.'"