He originally hailed from Ichikawa, Chiba Prefecture. Considered one of the most accomplished nature photographers of his era and compared to Ansel Adams, Hoshino specialized in photographing Alaskan wildlife until he was killed by a brown bear while on assignment in Kurilskoye Lake, Russia in 1996.

Lynn Schooler's book The Blue Bear relates the story of the author's friendship with Hoshino, a man he admired greatly for his skill as a photographer and his humanity. Schooler is a wilderness guide who became a photographer in his own right under Hoshino's tutelage. Another book, The Only Kayak by Kim Heacox, describes Hoshino's journeys to Glacier Bay as well as his own close personal friendship with Hoshino.

A memorial totem pole was raised in Sitka, Alaska, on August 8, 2008 (the 12th anniversary of Hoshino's death), in honor of his work. Relatives and witnesses from Japan, including his widow, Naoko, attended the ceremony. Hoshino's wife and son survive him.