With his success as an editorial writer, Hay's duties expanded. In October 1871, he journeyed to Chicago after the great fire there, interviewing Mrs. O'Leary, whose cow was said to have started the blaze, describing her as "a woman with a lamp went to the barn behind the house, to milk the cow with the crumpled temper, that kicked the lamp, that spilled the kerosene, that fired the straw that burned Chicago". His work at the "Tribune" came as his fame as a poet was reaching its peak, and one colleague described it as "a liberal education in the delights of intellectual life to sit in intimate companionship with John Hay and watch the play of that well-stored and brilliant mind". In addition to writing, Hay was signed by the prestigious Boston Lyceum Bureau, whose clients included Mark Twain and Susan B. Anthony, to give lectures on the prospects for democracy in Europe, and on his years in the Lincoln White House.