Diverse viewpoints as to the cause(s) of the extinction exist among active researchers even on the Berkeley campus. A weekly seminar is devoted to both reviewing existing evidence as well as discussing fresh new research results from the participants. The participants will formulate areas of consensus as well as areas of disagreement, and propose specific research foci needed to clarify unresolved components of a general theory of the extinction cause(s) and mechanism(s). The weekly meetings are largely but not exclusively composed of faculty, staff and students in the departments of Earth and Planetary Science, and Integrative Biology. Late in the Spring 2017 semester, a two-day conference open to the public will center on lectures by six internationally renowned experts from the U.S. and abroad, and four of the local participants, with round table discussions on each day following the lectures.