When Herman Miller's Aeron Chair was first released in 1994, it instantly became the world's benchmark for ergonomic sitting. Since then, it has sold over 8 million times. Yet, an equally supportive headrest remained a challenging and elusive component of the chair. A former Herman Miller engineer and former Herman Miller designer set out to solve this problem. In 2013, after three years of research and development, they introduced an ergonomically optimized cushion accessory that made a truly worthy addition to the Aeron — the Atlas Headrest. "The essence of the Aeron Chair's design is serving the human body, which we've obsessed over matching," says industrial designer Joe Parr, who worked closely on the final product.