Dr. Ethan Nielsen received his B.S. in Horticulture Science from Utah State University. He then went to earn his PhD in Horticultural Science from the University of Florida, where he worked to develop new varieties of disease resistant citrus, specifically grapefruit hybrids, concentrating on citrus canker (causal agent Xanthomonas citri ssp. citri) and Huanglongbing, also known as citrus greening disease (causal agent Candidatus liberibacter asiaticus). His expertise is in protoplasts and somatic fusion, and in propagating and tissue culture of Citrus. He has also worked with breeding Citrus relatives, such as Citropsis and Microcitrus, to seek out new sources of disease resistance which could then be incorporated into citrus cultivars through traditional breeding or advanced biotechnological methods. Additionally, he has a B.A. in Visual Arts from Brigham Young University, and worked as a graphic designer and illustrator before becoming a horticultural scientist.