Kallenbach was the owner of Tolstoy Farm and was a prosperous German Architect in Johannesburg. He became a devoted friend and co-worker of Gandhi's and he placed his Tolstoy Farm at the disposal of Satyagrahis.
He participated in the Satyagrahis great march and confronted white protesters. He accompanied Gandhi to India and many years later he visited Gandhi in Sevagram Ashram. He finally settled in Israel.