John Baines is Group Leader for the ATLAS High Level Trigger (HLT) group. He is also a member of the ATLAS Trigger Coordination and former member of the Trigger and DAQ (data acquisition) Steering Group.

Previously he has led the ATLAS Inner Detector Tracking Trigger Group, subsequently the ATLAS Trigger Signatures Group and was the UK High Level Trigger (HLT) Project Leader from 2008 to 2016.

He is currently the Integration Convenor for the HLT-FTK.