The Silver Age of Comic Books was a period of artistic advancement and commercial success in mainstream American comic books, predominantly those in the superhero genre. Following the Golden Age of Comic Books and an interregnum in the early to mid-1950s, the Silver Age is considered to cover the period from 1956 to circa 1970, and was succeeded by the Bronze and Modern Ages. A number of important comics writers and artists contributed to the early part of the era, including writers Stan Lee, Gardner Fox, John Broome, and Robert Kanigher, and artists Curt Swan, Jack Kirby, Gil Kane, Steve Ditko, Mike Sekowsky, Gene Colan, Carmine Infantino, John Buscema, and John Romita, Sr.  By the end of the Silver Age, a new generation of talent had entered the field, including writers Denny O'Neil, Gary Friedrich, Roy Thomas, and Archie Goodwin, and artists such as Neal Adams, Herb Trimpe, Jim Steranko, and Barry Windsor-Smith.