Dhardo Rinpoche, who died in 1990, was one of the eight spiritual teachers of Sangharakshita, founder of the Triratna Buddhist Community. They met whilst living in Kalimpong and developed a strong friendship. Sangharakshita regarded him as being a living Bodhisattva. Members of Triratna at the Aryaloka Buddhist Centre in the US have just engaged a Tibetan stonemason to build a stupa in their grounds in which will be put some of the ashes of Dhardo Rinpoche. You can read about the project here.
They were visited earlier this year by his tulku, the young Dhardo, and here he is talking at their centre.