Breaking through with his role as Philip Parker in the 2014 film Alexander and the Terrible, Horrible, No Good, Very Bad Day, Melcher would later star in the sequel to Ouija, Ouija 2, Kyle Turner in Law & Order SVU and he plays Griff Jones in season 2 of Bunk'd. Later this year (2017) he is voicing Charlie in Tom and Jerry Willy Wonka and the Chocolate Factory.
He earned his first professional role as a guest star in Scandal in 2013.
He has a sister named Louisa.
- He landed a recurring role as Mack in Nicky, Ricky, Dicky & Dawn and has also been seen on TV in the Thundermans and Agent Carter.