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Meet Our Residents

The Department of Neurological Surgery's residents for 2017-2018 are:

PGY-7, Chief Resident

Sean Kaloostian, MD, received his bachelor's degree from UC Riverside, where he was a Rhodes Scholar finalist and whose focus was on biology, psychology and sociology. He received his medical degree from UCLA, where he was in the Thomas Haider Program in Biomedical Sciences and developed an interest in neurosurgery. He completed a preliminary internship at UCLA before becoming a neurological surgery resident at UC Irvine School of Medicine.His hobbies include pick-up basketball and following the Atlanta Braves. His inspiration remains his mother, whose strength drives him every day.


Michelle Paff, MD, received her bachelor's of science degree from UC Irvine and went on to earn her medical degree at Drexel University College of Medicine (formerly MCP Hahnemann) in Philadelphia, Penn. As a neurological surgery resident, Paff has a great passion for the field and its subspecialties, including endovascular, pediatric neurosurgery, stereotactic radio-surgery and functional neurosurgery.Paff’s interest is in primary and metastatic brain tumors. In addition to neurosurgery, she has a passion for the arts.

Dr. Michelle Paff, UC Irvine neurosurgery resident


John Roufail, MD, completed a neurosurgery residency and clinical training in Egypt, where he earned a master's degree in surgery and PhD in cerebrovascular surgery research. At Oregon Health Sciences University in Portland, he was fellow in skull base and cerebrovascular surgery research. As a clinical fellow at the Cleveland Clinic in Ohio, he was a pediatric neurosurgery clinical fellows and studied the dynamics of cerebral spinal fluid and cerebral blood flow. As a neurological surgery resident at UC Irvine, he is interested in endoscopic skull base surgery, cerebrovascular surgery, spine surgery, epilepsy and movement disorders surgeries. He also enjoys swimming, scuba diving and community service.

Dr. John Roufail, UC Irvine neurosurgery resident


George Hanna, MD, earned his Bachelor’s Degree from the University of California, Los Angeles (UCLA) where he graduated Summa Cum Laude with Departmental and College Honors and was inducted into Golden Key Honor’s Society and Phi Beta Kappa. He moved on to Saint Louis University School of Medicine where he earned his medical degree and was inducted into Alpha Omega Alpha (AOA), the National Medical Honor Society, graduated with Distinction in Research and was inducted into Alpha Sigma Nu, the national Jesuit Honor Society. During medical school he earned multiple scholarship awards including the  2010 Pauletta and Denzel Washington Family Gifted Scholars Program in Neuroscience Award and the 2012 AMA Foundation Physicians of Tomorrow Award. His primary interests in neurological surgery include the skull base, vascular and neuro-oncology subspecialties. He is passionate about advocacy and helping underprivileged patients. In his spare time, he enjoys traveling, spending time with friends and family and participating in sports and outdoor activities.


Kieu Tran, MD, earned a bachelor's of science degree from the University of Missouri, Kansas City, MO., and a medical degree at the University of Utah, where she was awarded the Andrew J. and Carolyn Rice Schilly Scholarship, which is given to students for academic excellence. She is a member of the American Medical Association, Utah Medical Assocation, American College of Physicians, and American Medical Women's Association. She actively participated in a number of community and academic career opportunities while in Utah and throughout her life. She enjoys the outdoors, traveling and Broadway shows. She also has a passion for helping people in greatest need.

Dr. Kieu Tran, UC Irvine neurosurgery resident


Nathan Oh, DO, earned his bachelors of arts and science in economics, philosophy and biochemistry studying at the University of California, Irvine and Los Angeles. After graduation he worked as an investment banker prior to attending medical school, where he graduated from A.T. Still University, School of Medicine in Arizona. He has been nominated and selected as a member of the Golden Key Honors Society, Phi Beta Kappa Honors Society and Sigma Sigma Phi Medical Honors Fraternity.He is also a co-recipient for an NIH grant for his research in tumor biomarkers. As a former Division I athlete and junior olympian, he is an active community role model and in his free time he enjoys traveling, photography, playing and watching sports, watching movies and participating in community service activities in underserved areas.


Benjamin Ball, MD, attended both college and medical school at the University of Virginia. He was awarded the Merck Manual Award in his second year for outstanding academic achievement. His primary interest is in brain tumor surgery. In his spare time, he enjoys watching NCAA basketball, critiquing movies and reading Stephen King novels.

Dr. Benjamin Ball, UC Irvine neurosurgery resident


Joseph Falcone, MD, attended University of Washington School of Medicine in Alaska. He was awarded the UW School of Medicine Service Award in May 2014 in recognition of contributions to service learning, community service and advocacy in underserved communities. He is a published physician and has an interest in research.

Joseph Falcone, MD, UC Irvine neurosurgery resident


Jordan Xu, MD, attended Case Western Reserve University, School of Medicine in Ohio. He was awarded the Crile Research Award in 2014.He enjoys rock climbing, reading and traveling.