PersonJohn Mantley8 credits in the catalogue: writing, production.WritingThe 27th Day1957ScreenplayThe 27th Day1957NovelProductionGunsmoke1955Associate ProducerGunsmoke1955Executive ProducerGunsmoke1955ProducerThe Wild Wild West1965ProducerBuck Rogers in the 25th Century1979Executive ProducerMacGyver1985Executive Producer