He is credited with introducing to Siam the modern world map,[1][2] and producing a translation of the New Testament in Siamese (Thai) from Greek.

and Mrs. Jones worked with Adoniram Judson in Burma, residing for about two years at Maulmein, and later at Rangoon.

Destined to become the first long-term Protestant missionaries in the country, they arrived in April 1833 on the schooner Reliance owned by Robert Hunter, who was a friend of the Siamese foreign minister (known only by his office, that of praklang.)

Roberts, indeed, had been told American negotiations for a treaty were proceeding at an unprecedented pace.

Jones and his family to their new residence at Cokai, which had been arranged by the French-, English-, and Siamese–speaking Portuguese consul Mr. Silveiro, near a campong [settlement] of Burmese.

He possesses talents of a very superior order, and acquirements that do great credit to his industry; is mild and conciliating in his manners, forcible in his arguments, yet possessing a sufficient degree of zeal, never giving offence to the government, nor creating dislike by being over-zealous, and thereby disgusting the natives; but the bad state of his health would not permit him to remain on this good missionary ground, which may be made, in a few years, ready for the harvest.

[4]: 268, 270 Mr.Jones had completed in September 1833, a catechism on geography and astronomy in Siamese, besides translating into that language a small Burman tract containing a summary of Christian doctrines.