He was chosen to the General Assembly from Northumberland County, October 2, 1778, and while in attendance thereon was admitted to the Philadelphia bar, March 6, 1779. In 1779 he was a member of the Republican Society of Philadelphia, whose object was the revision of the Constitution of 1776.
In the fall of 1780 he returned to his former home in Lancaster and soon attained a large and lucrative practice, owned several farms and also became interested in the iron business. He represented Lancaster County in the Council of Censors, 1783 and 1784. He also was one of the original members of the Pennsylvania Society of the Cincinnati.
He was a delegate to the convention November 29, 1787, which ratified, on the part of Pennsylvania, the Federal Constitution. In the debate he took a most aggressive part, frequently becoming very personal in his attack upon members of the opposite side, especially toward William Findlay. Captain Chambers voted with his comrades in arms, and on the side of the adoption of the Federal Constitution.
It is a matter of interest that Captain Chambers was among the distinguished patriots who were in the house of James Wilson, in Philadelphia, when the mob made a disgraceful attack against it, October 4, 1779. Captain Chambers appeared with James Wilson, and others, before Supreme Executive Council, October 19, 1779, and was bound over to appear at the next term of court, in the sum of £5000. George Clymer and Samuel Caldwell becoming his sureties[sureties] in the sum of £2,500 each.
The evening of the day of the riot at “Fort Wilson,” Captain Chambers attended the Quarterly Communication of the Grand Lodge of Ancient York Masons and was installed Worshipful Master of Lodge No. 22, which was constituted at Northumberland the following month.
At the constitution of Lodge No. 22, about the middle of November, 1779, Chambers became its first Worshipful Master, and the warrant for that body was produced and presented by him at “his own proper cost and charges.”
In July, 1785, he became the warrant Worshipful Master of Lodge No. 43, at Lancaster, and both of these ancient lodges are still at labor, the former, Lodge No. 22, now at Sunbury.
Dr. Joseph Rieger was the surgeon of the Pennsylvania Rifle Regiment, commanded by Colonel Samuel Hiles. He was commissioned March 22, 1776. He was a highly respected physician of Lancaster. He died there in 1795.