Siegel a oa deskrivet gant an New York Times evel a director of tough, cynical and forthright action-adventure films whose taut plots centered on individualistic loners. Sevenet en deus ar film skiant-faltazi ha spont Invasion of the Body Snatchers (1956), ha pemp film all gant Clint Eastwood, evel ar film polis Dirty Harry (1971) hag an drama prizon Escape from Alcatraz (1979), ha film diwezhañ John Wayne, ar Western The Shootist (1976).