John Morgan R. N.,
Convict Ship Surgeon-Superintendent
John Morgan R.N., was employed as Surgeon Superintendent on the convict ship Mary to New South Wales in August 1819.
In October the Sydney Gazette reported that he was 'labouring under the deplorable calamity of violent mental derangement' and three fellow Royal Navy surgeons were assembled to assess his condition - Daniel Macnamara, Lancelot Armstrong and James Bowman 
John Morgan departed the colony on the Tuscan in July 1820 under the care of surgeon James Marr Brydone.
It may have been the same man who was employed as Surgeon Superintendent on the convict ship Captain Cook to New South Wales in 1833
References1). Sydney Gazette 16 October 1819