In 1835 he removed to Illinois and settled in Knox County, then near the frontier of civilization, where he lived for the next succeeding sixteen years, during which time he represented his county in both branches of the state legislature, serving with Lincoln, Douglas, Baker, Yates, Washburn and Trumbull, with all of whom he formed warm personal friendships, which lasted through life, despite political differences. In 1851, at an age when most men think they have outlived their usefulness and seek the repose demanded by their failing physical strength, accompanied by his children and grandchildren, he braved the toils and perils of an overland journey to this then remote wilderness upon the extreme borders of civilization and settled upon a farm in Marion County, Oregon, while his sons, Arthur A. and David T., took claims on Elliott Bay and were among the founders of Seattle, where they command universal respect for their intelligence, integrity and public spirit, Arthur having represented the territory as delegate in congress and served several terms in the Territorial Legislature. David has held many responsible public positions, including Probate Judge and Regent of the University, and is respected by all as a clear-headed and scrupulously honest man and most estimable citizen. John Denny remained in Oregon about six years, but held no official position there, for the reason that he was an uncompromising Whig and Oregon was overwhelmingly Democratic, including among the leaders of the Democratic party George H. Williams, Judge Deady, Gov. Gibbs and much of the best intellect of the state. He, however, entered warmly into the political discussions of the times, and many incidents are remembered and many anecdotes told of the astonishment and discomfiture of some of the most pretentious public speakers when meeting the unpretending pioneer farmer in public discussion. He was a natural orator and had improved his gift by practice and extensive reading. Few professional men were better posted in current history and governmental philosophy or could make a better use of their knowledge in addressing a popular audience. In 1859 he removed to Seattle, and from that time on to the day of his death was a recognized leader in every enterprise calculated to promote the prosperity of the town or advance its educational and social interests. No public measure, no public meeting to consider public enterprise, was a success in which he was not a central figure, not as an assumed director, but as an earnest co-operator, who enthused others by his own undaunted spirit of enterprise, and when past eighty years of age his voice was heard stirring up the energies of the people, and by his example, no less than his precepts, he shamed the listless and selfish younger men into activity and public spirit.