Faculty & Staff

Diane Stadler GPHN Director

Diane Stadler, PhD, RD, LD

Program Director, Dietetic Internship Director, Associate Professor

Dr. Stadler received a BS in Special Studies with an emphasis in Genetics and Development from Davidson College, an MS in Nutrition Science from Virginia Tech, and a PhD in Human Nutrition from the University of Iowa. She completed a post-graduate fellowship at the Kennedy-Krieger Institute/Johns Hopkins Hospital and focused in nutritional interventions for children with developmental disabilities and/or gene disorders. She worked with dietetic interns at the University of Iowa and directed the Nutrition Science and the Coordinated Masters Programs at the University of Utah before joining the faculty at OHSU in 2000.

Dr. Stadler is an Associate Professor of Medicine and Director of the Graduate Programs in Human Nutrition at OHSU.  Her clinical work and research has focused on dietary interventions for the treatment and prevention of disease including:

  • Nutritional rehabilitation of severely malnourished children in Zambia, Africa
  • Nutrition education and growth monitoring of infants and young children at risk for malnutrition in the rural mountainous region of eastern Honduras
  • Dietary treatment of children with rare genetic disorders
  • Use of extremely high fat ketogenic diets for children with severe, unresponsive seizure disorders
  • Comparing the health risks and benefits of very low-and high-complex carbohydrate diets for weight loss in obese adults
  • School-based interventions for diabetes prevention


Melanie GillinghamMelanie Gillingham, PhD, RD

Master's Program Director, Associate Professor

Dr. Melanie Gillingham is an Associate Professor in the department of Molecular & Medical Genetics and the Graduate Programs in Human Nutrition at Oregon Health & Science University. She received her BS in Nutrition from Texas Christian University, Ft. Worth, TX & her MS in Nutritional Sciences from University of Oklahoma, Oklahoma City, OK & completed her PhD at University of Wisconsin-Madison, Madison, WI. Dr. Gillingham coordinates the Masters programs and maintains an active research laboratory. Her research interests are on the nutritional treatment of inborn errors of metabolism and the effect of diet on fatty acid oxidation. The mitochondrial fatty acid oxidation (FAO) pathway is critical for survival during periods of fasting and for the maintenance of normal body weight and insulin sensitivity. The Gillingham Laboratory has been investigating the metabolic consequences of genetic disorders in the FAO pathway including inherited deficiency of very-long chain acyl CoA dehydrogenase (VLCAD), long-chain 3-hydroxyacyl CoA dehydrogenase (LCHAD) and carnitine palmitoyltransferase type 1A (CPT1A) deficiencies. FAO disorders are inherited in an autosomal recessive manner and collectively have an incidence of 1:9000 live births. Infants with a FAO disorder typically present with hypoketotic hypoglycemia and Reye-like symptoms precipitated by fasting or illness. The treatment for long-chain fatty acid oxidation disorders has been primarily with a modified diet including avoiding long periods of fasting, and frequent high carbohydrate meals. We have been investigating alternative nutritional approaches including fish oil supplements, medium-chain triglyceride supplements prior to exercise, and high protein diet low-fat diets on the outcomes and complications of these disorders. Dr. Gillingham is an active member of the Genetic Metabolic Dietitians International, the Society of Inherited Metabolic Disease, American Society of Nutrition and The Academy of Nutrition and Dietetics.


JM HeadshotJulie McGuire, MS, RDN, LD

Master's Program Coordinator, Instructor

Julie began her academic career at Whitman College in Walla Walla, WA, where she received a BA in Biology and Environmental Studies. After time spent volunteering with AmeriCorps and working in the field of clinical research, she returned to school and received a BS in Nutrition and Food Management from Oregon State University. She is an alumna from the program having completed her dietetic internship and MS in Clinical Nutrition at OHSU. Julie has worked as a clinical dietitian at Legacy Emanuel Medical Center and the VA Portland Health Care System. She has also instructed the Medical Nutrition Therapy course for the School of Biological and Population Health Sciences at Oregon State University. Julie's professional interests include nutrition-focused physical exam, oncology,  informatics, and the application of clinical research to the field of nutrition. Professional affiliations include the Academy of Nutrition and Dietetics and the Oregon Academy of Nutrition and Dietetics. She is also a Nutrition Physical Exam Trainer for the Academy of Nutrition and Dietetics.


Lexie JacksonLexie Jackson, MS, RDN, CD, CDE

Supervised Practice Coordinator, Instructor

Lexie began her academic career with a BA in psychology at Southern Methodist University in Dallas, TX. After realizing her passion for nutrition and weight management, she returned to school to complete a coordinated program in clinical nutrition at University of Texas Southwestern Medical Center in Dallas, TX. Lexie then began her career as a dietitian in research and outpatient nutrition, completing a MS in Clinical Research Management at Washington University in St. Louis, MO. Lexie has worked in a variety of outpatient settings, including diabetes, weight management and wellness. Her professional interests include weight management, igniting a passion for nutrition in dietetic interns, and utilizing nutrition education in the prevention of chronic diseases. Professional affiliations include the Academy of Nutrition and Dietetics, and the Washington State Academy of Nutrition and Dietetics where she currently serves on the board of directors as secretary. Lexie is currently a PhD student at Washington State University, Vancouver, WA in Prevention Science.


Jeri FinnJeri (Greenberg) Finn, MS, RD, LD

Supervised Practice Coordinator, Instructor

Jeri received her MS in Nutrition and Food Management from Oregon State University in 2005 and went on to complete the Mid-Willamette Valley Dietetic Internship in Salem. Prior to joining the OHSU Graduate Programs in Human Nutrition, she worked at the Oregon Dairy Council, where she managed the organization's school-based nutrition education programs. She joined the faculty in the Graduate Programs in Human Nutrition in 2010 as Internship Placement Coordinator and Instructor. She then served as Dietetic Internship Director from 2012 to June of 2015. Her professional interests reside within community and public health nutrition, specifically in the areas of adult education, counseling, health literacy, and weight management. Professional affiliations include the Academy of Nutrition and Dietetics, Nutrition and Dietetic Educators and Preceptors Practice Group, Public Health/Community Nutrition Dietetic Practice Group, and the Oregon Academy of Nutrition and Dietetics where she currently serves on the board of directors as president elect. She has also volunteered with the Commission on Dietetic Registration as an item writer and reviewer, and served as a member of the 2015 Entry-Level Dietetic Practice Audit Task Force.


Joyanna HansenJoyanna Hansen, PhD, RD, LD

Assistant Professor

Dr. Joyanna Hansen is a faculty member in the Graduate Programs in Human Nutrition and a Metabolic Dietitian in the OHSU Metabolic Clinic. Dr. Hansen completed her BS in biochemistry and molecular biology at Liberty University. In 2013, she earned a PhD in Nutritional Sciences from Cornell University with concentrations in epidemiology and genomics. Her doctoral research focused on the interplay of genes, nutrition, and chronic disease, with an emphasis on associations between vitamin D status and adult lung function. Dr Hansen's continuing research interests include gene-diet interactions that influence health outcomes as well as dietary interventions to reduce chronic disease risk. She is an active member of the Academy of Nutrition and Dietetics and Genetic Metabolic Dietitians International.


Sandy van CalcarSandra van Calcar, PhD, RD, LD

Assistant Professor

Dr. Van Calcar completed her undergraduate work at Oregon State University and Master's Degree in Nutritional Sciences from the University of Wisconsin-Madison. She then served as a metabolic dietitian in the Biochemical Genetics Program at UW-Madison and her practice included both patient care and clinical research for those with inborn errors of metabolism. She finished her doctorate degree in Nutritional Sciences from UW-Madison in 2009. Her dissertation focused on the use of glycomacropeptide (GMP) as a new protein source for treatment of phenylketonuria (PKU). Dr. Van Calcar joined the faculty of the Department of Molecular and Medical Genetics and Graduate Programs in Human Nutrition in 2014. Her current research interests focus on nutrition management of inborn errors of metabolism (IEM), with emphasis on classical galactosemia, fatty acid oxidation disorders and pregnancy in IEM. She is a founding member of Genetic Metabolic Dietitians International and currently Past-President of this organization. Membership in other national professional organizations include the Academy of Nutrition and Dietetics and the Society of Inherited Metabolic Disease.


Ash Ward HeadshotAsh Ward

Administrative Coordinator

Ash Ward is an administrative professional who has worked in higher education since 2010. She has worked for a variety of colleges in the Portland area including Portland State University, the Oregon College of Art and Craft, and Portland Community College before joining the OHSU team. She received a Baccalaureate degree with honors in the field of Psychology from PSU and is putting it to good use serving students on their own academic journeys.


Supporting Faculty

Carol DeFrancesco, MALS, RD, LD

Jessie Pavlinac, MS, RD, CSR, LD

Bert Connell, PhD, RD, LD

Joanna Cummings, MS, RD

Elizabeth Adams, PhD, RD, LD

Jackie Shannon, PhD, RD

Laura Zeigen, MA, MLIS, MPH