Dr. Jensen earned his medical degree at the University of Washington Medical School in Seattle. He completed a medical internship and first-year medical residency at University of Oregon and Affiliated Hospitals. He served in the US Army Medical Corps as a preventive medicine staff officer. Then he completed a second-year medical residency at Wadsworth Veterans Administration (VA) Hospital in Los Angeles, and a fellowship in gastroenterology through a joint program of UCLA and Wadsworth VA Hospitals. He has been on the faculty at these institutions and a member of the Center for Ulcer Research and Education Digestive Diseases Research Center (CURE: DDRC) since completion of his GI fellowship training.
Dr. Jensen is a professor of medicine (in-residence academic series) at the David Geffen School of Medical at the University of California, Los Angeles (UCLA). He is also associate director of the CURE: DDRC where he directs the Human Studies Core. He is key investigator and on the executive committee of CURE. In addition, he is a full-time staff physician in the UCLA Division of Digestive Diseases. He is also a part-time staff physician in the GI section of the VA Greater Los Angeles Healthcare Center. He directs the CURE Hemostasis Research Group which for more than three and a half decades, he has performed research, teaching, and patient care at UCLA and West LA VA Hospitals.
Dr. Jensen's research includes multi-center, prospective and randomized controlled trials in diagnosis and endoscopic hemostasis of gastrointestinal (GI) hemorrhage; primary and secondary prevention of GI bleeding; GI outcomes and health service studies; and technology assessment research related to endoscopy and GI bleeding. He has been continuously funded by investigator-initiated, peer reviewed federal grants since he first joined the UCLA faculty. He is or has been the principal investigator (PI) or a co-investigator on multiple studies jointly funded by the National Institutes of Health (NIH) and the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Also, he has received other research funding from the VA, Department of Defense, American Society for Gastrointestinal Endoscopy (ASGE), American College of Gastroenterology (ACG), and industry. He has been a member of different study sections including the VA Merit Review Board and the NIH Reviewers Reserve for special study sections, reviewer of K23 and K24 awards, and has been a member of site visits of proposals concerning gastrointestinal endoscopy, randomized controlled trials, GI technology, and clinical and outcomes research studies.
Dr. Jensen has several sources of research funding for ongoing and new studies. He just received a new five-year grant from the Veterans Administration (VA) Research Service (merit review clinical grant) for a randomized controlled trial (RCT) of Doppler endoscopic probe for prevention of delayed post-polypectomy induced ulcer bleeding. Two recently completed five-year RCT's funded as part of a VA Merit Review Research grant were performed and reported by the CURE Hemostasis Research Group utilizing blood flow monitoring with Doppler endoscopic probe for risk stratification and improving endoscopic hemostasis in severe UGI bleeding of both severe non-variceal UGI lesions and esophageal varices/other focal lesions related to portal hypertension. He also has research funding through the CURE:DDRC grant and directs the Human Studies Core which supports multiple investigator's clinical and outcomes studies. Another ongoing study recently supported by the CURE:DDRC and the UCLA CTSI is a RCT of severe, refractory or recurrent non-variceal UGI hemorrhage comparing large over-the-endoscope hemoclipping with standard endoscopic hemostasis. He also is the principal investigator of an NIH GI T32 training grant which funds research trainees who aspire to be the next generation of investigators in digestive diseases.
Dr. Jensen has published more than 263 peer reviewed papers, case reports, chapters, books, and reviews and also has 303 abstracts. He has been on several editorial boards and is a regular reviewer for such peer-reviewed journals as the New England Journal of Medicine, Annals of Internal Medicine, JAMA, Gastroenterology, American Journal of Gastroenterology, Gastrointestinal Endoscopy, and Endoscopy.
Dr. Jensen has successfully mentored many young clinical, outcomes, and endoscopy investigators for research and career development for over 35 years. Many of his trainees are full-time faculty or clinical faculty of academic medical centers in the US or abroad. He is the PI and director of an NIH T32 training grant for gastroenterology at CURE, UCLA, and the VA; and previously had funding of an NIH K24 grant for mentoring and clinical research. He has received both local and national awards as a distinguished lecturer, distinguished mentor, educator, and clinical researcher. Dr. Jensen has served on numerous committees of the ASGE and is a past councilor of the ASGE. He also recently was a member of the ACG Research Committee. In May 2012, Dr. Jensen was awarded the Rudolf V. Schindler Award, the highest award of ASGE.