Belle,
I'm really please you had a look at his biography on Wikipedia as this was one of the key reasons for dedicating the tree to him, so that more people would know who he is.

We were fortunate to have with us a lady who lives in Sydenham and met Korczak in the Warsaw ghetto, creating a real sense of continuity from Korczak's visit to Forest Hill 100 years ago, his contemplation in the park, to the planting of the tree this weekend.