Robert Phipps, professionally known as Rob Endling, is a writer, producer, and mixer based in Las Vegas. Originally recruited by Kane Churko to work at The Hideout Recording Studio, he quickly became involved with a variety of projects spanning rock, metal, and hip-hop. His credits include collaborations with rapper Ekoh, metal band Ded, and rock act Otherwise, with his co-write Lifted gaining traction on the rock charts.

Under his Rob Endling moniker, Phipps co-wrote NASTY from ONE OK ROCK's 2025 album DETOX, contributing to the track's aggressive energy and modern production style.