Simplify the following text for a Grade 8 native English-speaking person.
Original: Some hard SF authors have distinguished themselves as working scientists , including Gregory Benford , Geoffrey A. Landis and David Brin , while mathematician authors include Rudy Rucker and Vernor Vinge .
Simplified: Some hard SF writers have also worked as professional scientists . A few of these scientist\/writers are Gregory Benford and Geoffrey A. Landis , while mathematician authors include Rudy Rucker and Vernor Vinge .