John Eichelberger from the USGS has the honor of serving as the 6th Potter Lecturer. John will be giving two talks with the first scheduled for April 22 @ 7:00 p.m. in Denny 317 and titled "Volcanoes as Geysers" and the second scheduled for April 23 @ 12:00 p.m. in Kaufman 179 and titled "Of Dikes and Magma Chambers: The Great Katmai Eruption of 1912".