First of the group of artists properly classified with the Hudson River school was Thomas Doughty; his tranquil works greatly influenced later artists of the school. Albert Bierstadt glorified the Rocky Mts. in the West, working in the same manner as the painters in the East. Thomas Cole, whose dramatic and colorful landscapes are among the most impressive of the school, may be said to have been its leader during the group's most active years. Hudson River School landscapes are characterized by their realistic, detailed, and sometimes idealized portrayal of nature along with the juxtaposition of colonialism and wilderness.