In mid-September, the School of Law at the University of Colorado at Boulder will host visiting professor Joseph L. Sax, an expert in environmental and natural resources law. Sax, a professor at the University of California-Berkeley, will spend Sept. 13 to Sept. 18 with CU-Boulder law faculty and students and with members of the local legal community. He will team-teach classes with several faculty members and will host a brown bag luncheon for students Thursday, Sept. 17, to discuss the topic "Endangered Species Act Reauthorization: What's (Not) Going On."