Instead of giving the guy shit for not knowing about bands he hasn't come in contact with, how about just good stepping stone band suggestions.
@ Wormed Pretty sure it's going take him some time to like them
Anyway, you requested heavy but I don't think you know what you are getting into.
I would recommend starting with death metal/melodic death and branching out if you like stuff like Devildriver, KsE, and Disturbed.
Soilwork, Scar Symmetry , In Flames, Dark Tranquility are all melodic death metal, which should be more easily accessible to a beginnner.
Classic old school death metal, you need to start with bands like Death, Morbid Angel, (old) Dismember, etc.
There is a lot of music out there, and tbh even though I like Devildriver and KsE and Disturbed, there is tons of better metal out there that you will not find listening to any radio or headbangers ball etc. Gotta dig for the good stuff.