He didn't contribute a lot to Transformers, with just four cartoon episodes to his name, but Len Wein was more famous to comic fans, with a long history with Marvel comics (he was even one of the writers included on the recent "Marvel 75th" documentary).

His Transformers credits span 29 years, of just the four episodes...
- Original Series "Webworld"
- Beast Wars "Tangled Web"
- Beast Machines "Savage Noble"
- RID 2015 "Cover Me"

He died on Sunday, possibly related to recent surgeries he was having.