What is an MSL? Role, skills and career path
A Medical Science Liaison (MSL) is the field-facing scientific role within Medical Affairs — the person who builds and maintains scientific relationships with healthcare professionals, researchers and other experts, grounded strictly in evidence and independent of commercial promotion.
What an MSL actually does
- Scientific exchange with physicians, researchers and other healthcare stakeholders
- Gathering and structuring medical insights from the field
- Supporting evidence generation and investigator-initiated research
- Preparing and presenting at scientific meetings and congresses
- Responding to unsolicited medical information requests
Core skills
Deep scientific and therapeutic-area knowledge is the foundation. On top of that: the communication skill to translate complex evidence clearly, the relationship skill to build long-term scientific trust, and — increasingly — comfort with digital tools and AI-assisted preparation. See Digital Medical Affairs for how the skill set is evolving.
Career path
Most MSLs come from a strong scientific background — PhD, PharmD, MD or a related life-sciences degree — often after time in academic research, clinical practice or another industry role. From there, the path can lead toward senior/therapeutic-area-lead MSL roles, Medical Affairs management, or specialised tracks in evidence generation, medical communications or digital innovation.
Where the role is heading
The core of the role — scientific judgement and genuine relationship — isn't going anywhere. What's changing is the toolkit around it. See The Future of Medical Affairs.