Biotechnology Biogen boss Michel Vounatsos and his predecessor George Scangos, Bluebird Bio chief executive Nick Leschly and John Maraganore, the man at the helm of Alnylam Pharmaceuticals, are just a few of the 166 biotech leaders who have opposed an executive order signed by US President Donald Trump barring the entry of citizens from seven predominantly-Muslim countries into the USA. 7 February 2017