During this period , he held various positions such as Senior Research Scientist ( 1998 -- 2001 ) , Staff Research Scientist ( 2002 -- 13 ) , Staff Scientist ( 2013 -- 14 ) .
During this period , he headed the Virology Group from 2013 to 2014 .
During this period , he held various positions such as Senior Research Scientist ( 1998 -- 2001 ) , Staff Research Scientist ( 2002 -- 13 ) , Staff Scientist ( 2013 -- 14 ) and headed the Virology Group from 2013 to 2014 .