BECKING JH (1992) Dutch Ornithological Union: In Memoriam - JG Kooiman (1905 - 1989). LIMOSA 65 (4): 176-177.

On April 28, 1989 died at age 84 at Versailles Gerald January (Hans) Kooiman. With him was a skilled Dutch-Indian ornithologist of the old guard and a great expert in the field of East Javanese birds gone. Hans Kooiman was born May 27, 1905 in Amersfoort the youngest son of a family of seven children. His father was an officer and later held a position at the General Staff. At an early age showed Hans Kooiman great love for nature. He undertook extensive rambles on the Veluwe, Texel and Terschelling. Deeply shocked by the sudden death of a brother and his mother (born Bellaart a) three weeks later, in 1923 he hooked off for final exams HBS-B. With another brother, working as a buyer my wood, he goes further down for two years to Poland. in 1925 he married Barbara Maria Jacoba ten Bosch, a old school friend. Since there is little in the wood industry earn vah, applying it on the advice of his father (former naval officer in Surabaya) to a planters feature the Agricultural society OudDjember. After his military service performed in Malang to have, he is employed by several companies of the family group Birnie (coffee and rubber plantations). Naeen appointment to Dampar and Renes (a division of Dampar) Voigt finally the appointment the company Klatakan (at Tanggoel). in that time, the group led by David Birnie, who by the planters usually King David was mentioned. It was just partially cleared tropical laagland1egenwoud with its lush vegetation and exotic bird fauna should Kooiman fascinated.

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