John da Graca, Ph.D. – received his Ph.D. from University of Natal (South Africa). He was appointed to faculty of Texas A&M University-Kingsville Citrus Center, Weslaco, in 1999 and currently holds the rank of Professor and Deputy Center Director in the Department of Agronomy & Resource Sciences and the Citrus Center, respectively. John has no teaching responsibilities, but presents guest classes on Citrus and conducts research in Citrus Virus Diseases.