Following a brief career as an attorney, Catlin produced two major collections of paintings of American Indians and published a series of books chronicling his travels among the native peoples of North, Central, and South America. Spurred by relics brought back by the famous Lewis and Clark Expedition of 1804–1806 owned by his friend, Charles Willson Peale, and claiming his interest in America’s 'vanishing race', sparked by a visiting American Indian delegation in Philadelphia, he set out to record the appearance and customs of America’s native peoples.[citation needed]