Company leader
Rob Rebak
Chief Executive Officer
Calibrate
Rebak leads Calibrate through its shift toward employer and health-plan obesity management and GLP-1 cost control.
Rob Rebak is chief executive of Calibrate, a metabolic health company selling obesity programs to employers and health plans.
He became CEO in 2025 after prior private-equity-backed healthcare operating roles, succeeding Rob MacNaughton as the company accelerated its enterprise transition.
Company announcements in 2026 describe enterprise clients as the large majority of the business, with coaching and clinical oversight positioned alongside medication pathways.