(1908 - 1997)
Jacobi was born in Minneapolis, Minnesota, and lived there throughout his life. He attended the University of Minnesota, where he began his writing career in campus magazines and was an undergraduate classmate of Donald Wandrei. From 1932 until his death in 1997, fellow pulp writer Hugh B. Cave and Jacobi corresponded. Their letters are quoted in Cave's memoir Magazines I Remember (1994).
Jacobi's published books, all collections of his short stories, were Revelations in Black (1947), Portraits in Moonlight (1964), Disclosures in Scarlet (1972), East of Samarinda (1989), and Smoke of the Snake (1994). He won the Minnesota Fantasy Award in 1988.
Jacobi died at St Louis Park, Minnesota on August 25, 1997.