 He would visit and entertain them, he bought them an organ, and opened up his own mansions during cholera and smallpox epidemics for the treatment of patients.Parkman was involved with the organization and publication of "The New England Journal of Medicine and Surgery" with John Collins Warren and John Ware in 1823.When his father died in 1824, George took complete control of the family estate and bought vast amounts of land and real estate in Boston, including many poorly maintained tenements.