 Grosse investigated many other cases, and served as a member of the Society for Psychical Research's Council, as well as being the long-serving Chairman of its Spontaneous Cases Committee.In 1995 Grosse was at a vigil in Charlton House when it was claimed that a piece of crockery materialised and shattered.In 2000 he recorded what he claimed were poltergeist knockings on videotape at the home of a family in north London.