Thomas Heyward Hays

Thomas Heyward Hays (21 September 1854 – 2 February 1924) was an American surgeon who lived and worked in Siam (now Thailand), overseeing some of the country's first hospitals.

He arrived in Bangkok with the Presbyterian Mission Agency, and subsequently entered government service, serving as chief physician of the Royal Siamese Navy and head of the Bangrak Hospital (now Lerdsin Hospital).

The 1908 publication Twentieth Century Impressions of Siam describes his biography as follows: Dr. T. Heyward Hays, who now holds the combined positions of Principal Medical Officer to H.S.M.

He obtained his professional training in America, and arriving at Bangkok in October, 1886, he shortly afterwards entered the Government service, at the frequent and earnest solicitations of H.R.H.

Since then he has undertaken many responsibilities and carried out a great deal of important work tending towards the improvement of the medical administration of the country generally.