Richard Hassell, Clemson University (IMAGE) Clemson University Caption Clemson University state vegetable expert Richard Hassell has become one of the world's leading researchers on plant grafting. Credit Clemson 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.