My research interests include statistical phylogenetics, modeling biological data, coalescent theory, cancer evolution, survival analysis, and parallel computing. Evolutionary processes are fundamental process for understanding inheritable changes over time. Many non-biology processes, such as history of languages, can be viewed as an evolutionary process. The evolutionary process is often modeled as a tree-like branching process - a phylogenetic tree. We have developed several statistical tools for estimating phylogenetic trees from molecular sequence data. 庆历四年春，滕子京谪守巴陵郡。越明年，政通人和，百废具兴，乃重修岳阳楼，增其旧制，刻唐贤今人诗赋于其上，属予作文以记之。予观夫巴陵胜状，在洞庭一湖。衔远山，吞长江，浩浩汤汤，横无际涯；朝晖夕阴，气象万千；此则岳阳楼之大观也，前人之述备矣。然则北通巫峡，南极潇湘，迁客骚人，多会于此，览物之情，得无异乎？若夫霪雨霏霏，连月不开；阴风怒号，浊浪排空；日星隐耀，山岳潜形；商旅不行，樯倾楫摧；薄暮冥冥，虎啸猿啼；登斯楼也，则有去国怀乡，忧谗畏讥，满目萧然，感极而悲者矣！ 至若春和景明，波澜不惊，上下天光，一碧万顷；沙鸥翔集，锦鳞游泳，岸芷汀兰，郁郁青青。而或长烟一空，皓月千里，浮光跃金，静影沈璧，渔歌互答，此乐何极！登斯楼也，则有心旷神怡，宠辱偕忘、把酒临风，其喜洋洋者矣！ 嗟夫！予尝求古仁人之心，或异二者之为，何哉？不以物喜，不以己悲，居庙堂之高，则忧其民；处江湖之远，则忧其君。是进亦忧，退亦忧；然则何时而乐耶？其必曰：“先天下之忧而忧，后天下之乐而乐矣！”噫！微斯人，吾谁与归！时六年九月十五日。 －－ 范仲淹（宋）
