Dr. Twelker received his Doctor of Optometry from the University of California, Berkeley College of Optometry in 1992. He worked in private practice for several years before returning to obtain his Ph.D. in Vision Science from The University of California, Berkeley. Since 2002, he has been on the faculty of the University of Arizona Department of Ophthalmology and Vision Science where he is an Associate Clinical Professor. He was the Site Principal Investigator for the Collaborative Longitudinal Evaluation of Ethnicity and Refractive Error from 2002 through 2012, which looked at the effect of ethnicity on eye growth and the need for spectacle correction. He was elected President of the Arizona branch of VOSH in 2015 and continues to serve in that position. In the fall of 2015, Dr. Twelker took leave of his position in Arizona to teach optometry at the Masinde Muliro University of Science and Technology in Western Kenya. In 2016, Dr. Twelker was elected to the Board of Directors for VOSH International, with his main emphasis being to support and sustain optometry education efforts in developing countries such as Malawi, Kenya, and Mexico. Dr. Twelker can be contacted at firstname.lastname@example.org.