|Born||11 September 1899|
|Died||29 June 1953(aged 53)|
Men's Greco-Roman bantamweight (-58 kg)
- First round – defeated French champion Georges Appruzeze France (FRA) by fall 13min 10s.
- Second round – lost to 1932 Summer Olympics champion Giovanni Gozzi Italy (ITA) with points.
- Third round – lost to 1921 world champion and later Bronze medalist Väinö V. Ikonen Finland (FIN) with points. (→ did not advance, 13.-16. place)
Men's freestyle featherweight (-61 kg)
After Olympics he didn't return to home, but arrived, according to The Estonian Archives in Australia (EAA), 16 February 1925 from Campbeltown to Adelaide, Australia on the four-masted Barque "Carthpool" (Sister ship of Lawhill).
In Australia within the first fortnight of his career as a professional wrestler Koolmann won in seven successive championship matches, two state championships, three Victorian and two Australasian amateur championships. He won Australian middleweight championstitle from Hughie Whitman.
15 October 1928 he moved to New Zealand and got citizenship in 1933.
Late 30's, he trained many New Zealand wrestling champions in his Koolman's Gym in Wellington. Among them Ernie "Kiwi" Kingston and from 1951 Maori professional heavyweight wrestler Keita Meretana of Wairoa.
|1924||Estonian National Championships||Tallinn, Estonia||1st||Greco-Roman wrestling / -57 kg|
|1924||Olympic Games||Paris, France||10th||Men's freestyle featherweight -61 kg|
|1924||Olympic Games||Paris, France||13-16th||Men's Greco-Roman bantamweight -58 kg|
- Kuningas, Tiit; Tiit Lääne (2005). Olümpiamängude ajalugu II, suvemängud 1920-1944 (en: History of the Olympic Games II Summer Games 1920-1944) (in Estonian). Tallinn: Maalehe Raamat. ISBN 9985-64-255-4.
- A little piece of San Francisco in Wellington! - former Koolman's Wrestling Gym in 171 Cuba Street, Wellington