
Hiroshi Koizumi (小泉博, Koizumi Hiroshi, birth name written as 小泉 汪) (12 August 1926 – 31 May 2015) was a Japanese actor, best known for his starring role in the 1955 film Godzilla Raids Again as well as other Toho Studios monster movies. He was born in Japan. He is a graduate of Keio University in Tokyo.
In a 1999 interview with Steve Ryfle, Koizumi laments that while he stated he has easy parts to play, he felt he could have done more in his performances. Despite his roles where he usually plays a scientist, he plays a powerful role in Late Chrysanthemums, playing a young man that married an older wealthy woman to escape from the slums. On 31 May 2015, Koizumi died at a hospital in Tokyo from pneumonia at the age of 88.
Description above from the Wikipedia article Hiroshi Koizumi, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Ikiru
1952 · as Jazz Bar Guest (uncredited)

Godzilla Raids Again
1955 · as Shoichi Tsukioka

Mothra vs. Godzilla
1964 · as Professor Shunsuke Miura

Ghidorah, the Three-Headed Monster
1964 · as Professor Murai

Godzilla vs. Mechagodzilla
1974 · as Professor Wagura

Godzilla 1985
1985 · as Geologist Minami

The Return of Godzilla
1984 · as Professor Minami

Godzilla: Tokyo S.O.S.
2003 · as Dr. Shin'ichi Chûjô

Mothra
1961 · as Dr. Shin'ichi Chûjô

Dogora
1964 · as Kirino

Chûshingura
1962

Japan's Longest Day
1967 · as Nobukata Wada - NHK Broadcaster

Matango
1963 · as Naoyuki Sakuta - Skipper

Atragon
1963 · as Inspector

Daughters, Wives and a Mother
1960 · as Hidetaka Tani

Prophecies of Nostradamus
1974 · as Environmental scientist #2

The Last Embrace
1953 · as Yoshikawa (Sampei)

Battle of the Japan Sea
1969 · as Kurino