Abstract: An adjustable work chair comprising a frame, a seat support structure, and a versatile seat combination. The adjustable work chair has a seat support structure which allows alterations to the seat's height and orientation. Furthermore, the adjustable work chair may be mobile through alternative embodiments using hinged castors, may provide knee support through alternative embodiments including knee pads, or may have a tray for holding instruments, parts, tools, or other equipment. The adjustable work chair provides a comfortable platform that allows the operator to efficiently perform tasks over a prolonged time frame. Additionally, embodiments of the adjustable work chair provides a platform which allows the operator to alter the seat's height, location, or orientation to provide a wide range of positions ranging from a seating position to a creeper position.