United states securities and exchange commission

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Michael D. Ehlers, M.D., Ph.D.
Experience
Dr. Ehlers has served as our Executive Vice President, Head of Research and Development since May 2016. Prior 
to joining Biogen, from August 2010 to April 2016, Dr. Ehlers served in leadership positions at Pfizer, Inc., a 
biopharmaceutical company, including Senior Vice President & Head BioTherapeutics R&D and Chief Scientific 
Officer, Neuroscience & Pain. Prior to that, Dr. Ehlers was the George Barth Geller Professor of Neurobiology and an 
Investigator of the Howard Hughes Medical Institute at Duke University Medical Center. He is the recipient of 
numerous awards including the Eppendorf & Science Prize in Neurobiology, the John J. Abel Award in Pharmacology, 
the Society for Neuroscience Young Investigator Award, a National Institute of Mental Health MERIT Award, the 
National Alliance for Schizophrenia and Depression Distinguished Investigator Award and the Massachusetts 
Medical Society Honored Business Leader Award. In 2013, Dr. Ehlers became the 11
th
 recipient of the Thudichum 
Medal of the Biochemical Society of the United Kingdom. Past recipients include two Nobel laureates. Dr. Ehlers 
has authored over 100 scientific papers, has served on the Editorial Boards of Annual Reviews in Medicine, Annual 
Reviews in Pharmacology and Toxicology, the Journal of Neuroscience, the Journal of Biological Chemistry, the 
Journal of Molecular and Cellular Neuroscience and has sat on advisory committees of the National Institutes of 
Health.
Outside Affiliations
PhRMA Foundation Basic Pharmacology Advisory Committee
Janelia Research Institute Advisory Committee
McKnight Endowment Fund for Neuroscience Board
World Economic Forum Global Agenda Council on Brain Research
Education
California Institute of Technology, B.S. Chemistry
The Johns Hopkins University School of Medicine, M.D.
The Johns Hopkins University School of Medicine, Ph.D. Neuroscience
Ginger Gregory, Ph.D.
Experience
Dr. Gregory has served as our Executive Vice President and Chief Human Resources Officer since July 2017.  Prior
to joining Biogen, Dr. Gregory served as Executive Vice President and Chief Human Resources Officer at Shire PLC,
a global specialty biopharmaceutical company, from February 2014 to April 2017. Prior to that, Dr. Gregory held
executive-level human resources positions for several multinational companies across a variety of industries,
including Dunkin’ Brands, where she served as Chief Human Resource Officer; Novartis, AG, where she was the
division head of Human Resources for Novartis Vaccines and Diagnostics, Novartis Consumer Health and Novartis
Institutes of BioMedical Research from 2005 to 2012; and Novo Nordisk, where she served as Senior Vice
President, Corporate People & Organization at the company’s headquarters in Copenhagen, Denmark. Earlier in her
career, she held a variety of human resources generalist and specialist positions at Bristol-Myers Squibb and
served as a consultant with Booz Allen & Hamilton in the area of organization change and effectiveness.
Education
University of Massachusetts B.A., in Psychology
The George Washington University, Ph.D. Psychology
Chirfi Guindo
Experience
Mr. Guindo has served as our Executive Vice President and Head of Global Marketing, Market Access and
Customer Innovation since November 2017. Prior to joining Biogen, Mr. Guindo spent 27 years in the global
pharmaceutical industry and has held several leadership positions at Merck in Canada, the U.S., France, Africa and
the Netherlands.  He worked in several disciplines including Finance, Sales & Marketing, General Management and
Global Strategy/Product Development in specialty, acute and hospital care. Most recently Mr. Guindo was Vice
President and Managing Director and President and Managing Director of Merck Canada from October 2014 to
November 2017. From January 2011 to October 2014, he was Vice President and General Manager, Global HIV
Franchise at Merck & Co.
Education
Ecole Central de Paris (France), Engineering
Stern School of Business, New York University, M.B.A. in Finance/Economics

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Paul McKenzie, Ph.D.
Experience
Dr. McKenzie has served as our Executive Vice President, Pharmaceutical Operations and Technology since July
2016. Prior to that, from February 2016 to June 2016, he served as our Senior Vice President for Global Biologics
Manufacturing & Technical Operations. Prior to joining Biogen, since 2008, Dr. McKenzie held a number of positions
of increasing responsibility at Johnson & Johnson (J&J), including Vice President of R&D for J&J’s Ethicon business
where he led the manufacturing and technical operations team responsible for internal and external manufacturing
of Janssen’s pharmaceutical portfolio. He also ran global Development for Janssen R&D, helping to manage
pipeline activities from discovery through clinical development and commercialization. Prior to J&J, Dr. McKenzie
also held various R&D and manufacturing positions at Bristol-Myers Squibb and Merck & Co.
Education
University of Pennsylvania, B.S. Chemical Engineering
Carnegie Mellon University, Ph.D. Chemical Engineering
Alfred W. Sandrock, Jr., M.D., Ph.D.
Experience
Dr. Sandrock has served as our Executive Vice President and Chief Medical Officer since October 2017. Prior to
that, Dr. Sandrock served as our Executive Vice President, Chief Medical Officer Neurology and Neurodegeneration
from October 2015 to October 2017, as our Chief Medical Officer and Group Senior Vice President from April 2013
to October 2015 and as our Chief Medical Officer and Senior Vice President of Development Sciences from
February 2012 to April 2013. Prior to that, Dr. Sandrock held several senior executive positions since joining us in
1998, including Senior Vice President of Neurology Research and Development and Vice President of Clinical
Development, Neurology.
Public Company Boards
Board of Directors of Neurocrine Biosciences, Inc., a life sciences company
Education
Stanford University, B.A. in Human Biology
Harvard Medical School, M.D.
Harvard University, Ph.D. in Neurobiology
Massachusetts General Hospital, internship in Medicine, residency and chief residency in Neurology, and
clinical fellowship in Neuromuscular Disease and Clinical Neurophysiology (electromyography)
Available Information
Our principal executive offices are located at 225 Binney Street, Cambridge, MA 02142 and our telephone 
number is [phone]. Our website address is www.biogen.com. We make available free of charge through the 
Investors section of our website our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports 
on Form 8-K and all amendments to those reports as soon as reasonably practicable after such material is 
electronically filed with or furnished to the Securities and Exchange Commission (SEC). We include our website 
address in this report only as an inactive textual reference and do not intend it to be an active link to our website. 
The contents of our website are not incorporated into this report.

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