 In 1961 Grosse founded his own design and engineering consultancy business which became responsible for launching many patents throughout the world.A personal tragedy launched Grosse into psychical research, when his daughter Janet was killed in a motorbike accident in August 1976.Following her death, Grosse reported that members of his family experienced a number of coincidences and psychic happenings, and this led him to join the Society for Psychical Research and The Ghost Club.