Career
He was also a scientist and a Doctor of Medicine. The most notable species he described are:
Green neon tetra, Paracheirodon simulans (Géry, 1963)
Black neon tetra, Hyphessobrycon herbertaxelrodi (Géry, 1961)
Inpaichthys kerri, Inpaichthys kerri (Géry & Junk, 1977)
Hemigrammus bleheri, Hemigrammus bleheri (Géry & Mahnert, 1986)
Hyphessobrycon sweglesi, Hyphessobrycon sweglesi (Géry, 1961).