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In page Petra Wilder-Smith:

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Petra Elfrida Erna Beate Wilder-Smith[citation needed] is a professor and director of dentistry at the Beckman Laser Institute at the University of California, Irvine School of Medicine,[2] and a fellow of the Chao Family Comprehensive Cancer Center at the UC Irvine Medical Center. She is a visiting professor at RWTH Aachen University and a visiting lecturer at Loma Linda University. Wilder-Smith specializes in the use of light and optics in tracking and treating oral cancer. She has developed noninvasive laser technology used to examine and treat mouth lesions.[3][4]