Steve is also Professor Emeritus of Pediatrics at the University of Cincinnati and Children’s Hospital, Ohio, Honorary Professor in the Faculty of Medical and Health Sciences at Waipapa Taumata Rau | University of Auckland, and the Editor-in-Chief for The Pediatric Infectious Disease Journal.

He has more than 30 years of experience conducting clinical trials and vaccine safety studies including being the principal investigator for five pivotal phase III clinical trials, six phase IV post-licensure vaccine safety assessments, and the Centers for Disease Control and Prevention (CDC) funded multi-national SOMNIA project to evaluate the risk of narcolepsy following adjuvanted 2009 pandemic influenza vaccines. He founded the Kaiser Permanente Vaccine Study Center and was Co-Director from 1985 to 2007.

Steve participated in the World Health Organization (WHO) funded Global Vaccine Safety Initiative (GVSI) pilot project in that linked data to assess vaccine safety from countries in Europe, Asia, the Middle East, Australia and Latin America and led the international effort to highlight the importance of background rates in evaluating vaccine safety for pandemic vaccines. He has been an elected member of the International Brighton Collaboration Science Board and the work package lead for the Safety Platform for Emergency Vaccine (SPEAC) project Data and Safety Monitoring (DSMB) activities, funded by the Coalition for Epidemic Preparedness Innovations (CEPI).