Character Adam Kemper Wikipedia: Adam Kemper (link not verified) 2012 ▷ Played by Johnny Simmons once on Television in 'Elementary'. 18 Oct 2012:'Child Predator' 2012 ▷ Played by Andrew M. Chamberlain once on Television in 'Elementary', as Adam Kemper (age 12). 18 Oct 2012:'Child Predator'