You must be reffering to Lt Colonel David Jameson who was born in Culper, VA and lived in Yorktown:
David Jameson was Lieutenant Governor of Yorktown, Virginia and severed from 1780-81 under the Governorship of Thomas Nelson, Jr., signor of the “United States Declaration of Independence” and served in August of 1780 briefly as Governor when Nelson took ill. He was elected as a State Senator in 1783. He also served in the Senate during the War in 1776-1777, serving on Patrick Henry's Privy Council.
I believe he was married to a Mildred Smith of the Smith family of Yorktown.
I hope this help.
I would think there might be a portrait of him at the Library of congress, since he seems to be one of our founding fathers.