Stephen Francis Von Till Jr. is an American musician, best known as the guitarist of the metal band Neurosis, in which he also shared lead vocals with former member Scott Kelly. Following Kelly's departure in 2019, he is now the sole lead vocalist for the band. He also records solo work under both his given name and the moniker Harvestman.

Neurosis is an American post-metal band from Oakland, California. It was formed in 1985 by guitarist Scott Kelly, bassist Dave Edwardson, and drummer Jason Roeder, initially as a hardcore punk band. Chad Salter joined as a second guitarist and appeared on the band's 1987 debut Pain of Mind and then Steve Von Till replaced him in 1989. The following year, the lineup further expanded to include a keyboardist and a visual artist. Beginning with their third album Souls at Zero (1992), Neurosis transformed their hardcore sound by incorporating diverse influences including doom metal and industrial music, becoming a major force in the emergence of the post-metal and sludge metal genres.