PSU Biology Professor Ken Stedman (IMAGE) Portland State University Caption Ken Stedman, biology professor at Portland State University, won a major grant from NASA to study the evolution of viruses. Credit Portland State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.