Field Medical Science Liaison Regional Director

About the position Mirum Pharmaceuticals is a biopharmaceutical company dedicated to transforming the treatment of rare diseases. We are passionate about advancing scientific discoveries to become important medicines for rare disease patients. We are collaborative, creative, and experienced professionals and we’re looking to augment our team with other individuals who embody our values: care, be real, get it done, and have fun, seriously. Position Summary The Field Medical Science Liaison (MSL) Regional Director is a senior, field-based, hybrid Medical Affairs role designed initially as a player/coach leader. This individual will serve as both a hands-on MSL and a field medical leader, with responsibility for building, mentoring, and leading an MSL team over time. Initially, the MSL Lead will engage directly with key external stakeholders nationally, providing high-quality, non-promotional scientific exchange. As Mirum continues to grow, this role will evolve into a people leader position. The core responsibilities will be field medical strategy development, key opinion leader engagement (KOL) and operational excellence across the MSL organization.

Responsibilities

• Identify (KOLs) and the treatment landscape nationally including high prevalence areas of HDV management and treatment.
• Build peer-level relationships with KOLs, investigators, academic thought leaders in hepatology, infectious disease and other appropriate specialties while maintaining their trust as scientific partner/collaborator.
• Serve as a senior field-based MSL, conducting compliant, fair-balanced, non-promotional scientific exchange with key opinion leaders (KOLs), investigators, and other healthcare stakeholders in support of the Hepatitis D (HDV) program.
• Develop and maintain deep expertise in HDV disease state, mechanism of action, clinical data, and emerging literature.
• Identify unmet medical needs, emerging trends, and actionable insights; communicate these insights internally to the Global Medical Affairs Team (GMAT) to inform strategy.
• Support medical education activities, advisory boards, scientific congresses, and investigator-initiated research (as appropriate).
• Act as a player/coach, balancing individual field responsibilities with leadership and mentorship of MSLs as the organization expands.
• Support the expansion of the MSL organization including hiring, onboarding, training, and field readiness.
• Coach MSLs on scientific communication, stakeholder engagement, territory planning, and insight generation.
• Establish performance expectations, provide ongoing feedback, and support professional development.
• Help define field medical processes, best practices, and success metrics.
• Foster a culture of scientific excellence, collaboration, accountability, and compliance.
• Contribute to the development and execution of field medical strategy aligned with Mirum’s Medical Affairs objectives.
• Support Medical Affairs initiatives across clinical development, launch readiness, and lifecycle management.
• Work compliantly with cross-functional partners to support the overall brand strategy through effective communication of scientific information.
• Provide leadership input into launch planning, resourcing, and long-term Medical Affairs organizational design.
• Ensure all activities are conducted in compliance with company policies, SOPs, and applicable regulations.

Requirements

• Advanced scientific degree (PhD, PharmD, MD, DO, PA, NP or equivalent).
• 5+ years of experience in Medical Affairs or MSL roles within biotech or pharmaceutical companies.
• Significant field-based MSL experience with a strong record of scientific engagement.
• Excellent scientific communication and relationship-building skills.
• Ability to work effectively in a fast-paced, growth-oriented biotech environment.
• Willingness to travel extensively (approximately 50–70%).

Nice-to-haves

• 1-2 years of prior people management experience or formal team leadership.
• Experience building or scaling an MSL team.
• Hepatology, infectious disease, or rare disease experience
• Experience in early-stage or high-growth biotech organizations.

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