According to the Pennsylvania Historical and Museum Commission, "Albert Gallatin (1761 - 1849) was one of the most important and influential men of the early American Republic."
From a book about Albert Gallatin:
One politician indicated that "The influence of Messrs. Gallatin, Madison, and Jefferson must be diminished, or the public affairs will be brought to a stand." Here is found an early recognition of the political "triumvirate," and Gallatin is the first named."
Gallatin seems to have had some doubts as to his reelection to Congress. As he did not reside in the Washington and Allegheny district, his name was not mentioned as a candidate, and, to use his own words, he expected to "be gently dropped without the parade of a resignation." In his distaste at separation from his wife, the desire to abandon public life grew upon him. But personal abuse of him in the newspapers exasperating his friends, he was taken up again in October, and he arrived on the scene, he says, too late to prevent it. He had no hope, however, of success, and was resolved to resign a seat to which he was in every way indifferent. " Ambition, love of power," he wrote to his wife on October 16, he had never felt, and he added, if vanity ever made one of the ingredients which impelled him to take an active part in public life, it had for many years altogether vanished away. He was nevertheless reelected by the district he had represented.
Mr. Gallatin was appointed as the Secretary of the Treasury by President Jefferson. He served from 1801 until 1813. "After he left the Treasury Department, Gallatin became involved in the negotiations which led to the Treaty of Ghent, bringing the War of 1812 to a close. To reward him for this service, he was appointed Minister to France in 1815...". [Source: History Central]