 John C. Emmett, another medicinal chemist, is also credited as a co-discoverer of cimetidine.In addition to these key players, many others contributed to the research, such as William Duncan, the director of research at SK&F, as well as Michael Parsons, whose pharmacological experience was greatly beneficial.Ganellin's collaborators influenced him and imparted in him knowledge and experience which has remained with him throughout the decades.