Supports HR activities throughout mergers and acquisitions, including due diligence, Day 1 readiness, employee transitions, integration planning, workforce changes, compliance, change management, and post-close execution. Coordinates workstreams, tracks milestones, prepares reports and communications, manages confidential information, and collaborates with HR, Legal, Finance, IT, and business stakeholders. Maintains M&A playbooks, project tools, checklists, and lessons learned to improve future integration processes.