Lawyer.

A Maryland native from a wealthy family, Jenings was educated in England, where he later practiced law.

He corresponded regularly with Arthur Lee, but was later suspected of having been an agent for the British during the American Revolution.

He was also a member of a group of twenty men, including Thomas Digges and William Hodgson, who took up a subscription for the relief of American prisoners.

In 1779, Jenings was in France; while there he declined a dinner invitation from Franklin, who had given him a passport in March of that year.