Calvin Tower was the third-great-grandson of Stefan Toren, the owner and operator of The Manhattan Restaurant of the Mind, and a founding member of the Tet Corporation along with his friend Aaron Deepneau.

He sold a copy of Charlie the Choo-Choo and a riddle book to Jake Chambers, and later sold the vacant lot in Manhattan that contained the Rose to Roland Deschain. He and Tower once rescued Donald Callahan from Norton Randolph and William Garton.