A jazz drummer by trade, at Bakers and other local jazz lounges, and drawn over to Hitsville by Gordy to work in the 'snake pit' with all the other great musicians. H e with Jamerson - basically the guys behind the whole Motown groove (with Uriel Jones and Pistol Allen later on).....the best bottom end ....lol .....and they put the swing into it. Benjamin invented many of the 'pickups' for all those songs. He had serious vices, which eventually led to his demise.
As suggested above check out the Standing in the Shadows DVD (clips of it on YouTube as well).
Skip to about 10:00 for small words on him. It really is a great DVD with interviews of the surviving drummers, Jones and Allen (at the time of filming). There are also some great Motown books.
Like a lot of 60's music, they seem to have unfortunately had drum tracks down in the mix, so the full sound of his work cannot be heard so well.