 Ho coauthored the "Atlas of Victorian Birds" (1987).He was also involved in studies of the white-bellied sea-eagle, peregrine falcon, long-billed corella, sulphur-crested cockatoo, red-tailed black-cockatoo, malleefowl and black-eared miner.Emison joined the Royal Australasian Ornithologists Union (RAOU) in 1974 and served it as a Councillor 1982–1986, as Secretary 1983–1986.