Herbert William Mullin was an American serial killer born on April 18, 1947 who operated in Santa Cruz, CA. 
Mullin was serving life in prison for 13 murders which he says he committed to prevent further natural disasters.  Mullin died of natural causes on August 18, 2022.

8 1/2" x 11" "Poem In Appreciation" penned on the front hand dated and hand signed, HWM 11/14/1988.
On the back Mullin has included two more of his writings at later dates from 1993 and 2006. Dream Shaman from 2003 is hand signed, HW Mullin.
Peace and friendship penned in 2006 is hand signed in full, Herbert William Mullin.