Dr. R. Paul Schreiner is a Research Plant Physiologist at the USDA-ARS, Horticultural Crops Production and Genetics Improvement Research Unit in Corvallis, OR. Paul conducts research on grapevine physiology with a focus on plant nutrition, and the functioning of roots and arbuscular mycorrhizal fungi. He received a BS in Biochemistry from Penn State University in 1985, and a PhD in Plant Physiology from Penn State University in 1992. Paul has worked on mycorrhizal fungi since 1988 and on grapevine physiology since 1999. He has published more than 60 peer-reviewed research papers, and more than 50 other publications.