Thomas Knoll is the inventor of Photoshop. He was married to Ruth Knoll, who was a co-founder of Summers-Knoll School.

In 1987, Thomas Knoll, then a PhD student at the University of Michigan, began writing a program on his Macintosh Plus to display grayscale images on a monochrome display. This program, called Display, caught the attention of his brother John Knoll, an Industrial Light & Magic employee, who recommended Thomas turn it into a full-fledged image editing program. Thomas took a six month break from his studies in 1988 to collaborate with his brother on the program, which had been renamed ImagePro. In 1988, Thomas renamed his program Photoshop and worked out a short-term deal with scanner manufacturer Barneyscan to distribute copies of the program (under the name Barneyscan XP) with their scanners.

Tom is a 1978 graduate of Huron High School.

Wikipedia: Photoshop