Hongshik Ahn, Professor, B.S. in Mathematics, Seoul National University, Ph.D. in Statistics, 1992, University of Wisconsin-Madison: Biostatistics; Survival Analysis, Machine Learning Hongshik Ahn’s specialty is tree-structured regression modeling for censored survival data, classification of high-dimensional data, and machine learning. After earning his Ph.D., he initially worked as Mathematical Statistician at the National Center for Toxicological Research (NCTR) on animal carcinogenicity, developmental toxicology, and drug stability analysis. He came to Stony Brook in 1996. He continued working on NCTR problems while developing collaborations with Stony Brook biomedical researchers and researchers in New York University and Mount Sinai Medical School