Monthly report for February 2000 by Christian A. Hummel: Hummel finished a first draft of the Omicron Leonis paper and sent it to Roger Griffin for comments. Hummel also obtained more PTI data from Andy Boden on this double star. Hummel completed a detailed summary of his raw data analysis and prepared a presentation for the quarterly meeting of NPOI in Flagstaff. Hummel wrote two papers to be given at conferences in Munich and Potsdam in March.