Landgrebe’s family has filed a police report and will begin investigating his whereabouts.
Landgrebe left home May 25 to hitchhike across country and write about his experiences.
KCCI reports, Landgrebe’s mother, Susanne, last heard from him June 24. Landgrebe told his mother he was in Salt Lake City.
Susanne said Daniel told her he was planning to head north to Jackson, Montana.
Susanne says that before he left, she told her son he had to contact her every two to three days.
It is now twelve days since she has heard from him.