This paper discusses the initial development of Marine Cloud Brightening (MCB) as a theoretical idea, from its inception as a cloud microphysics process in circe 1990 to the full-blown concept by 2015. It primarily focuses on the work of founders John Latham and Stephen Salter and their contributions. Recently the concept has been developed further, e.g. in the UK ARIA project, as a prospective method to ameliorate the Earths rapid warming.