Carl was part of CIRES for 30 of its first 35 years. He received his Ph.D. from St. Louis University, and was on the faculty there before he came to the University of Colorado Boulder to lead CIRES through adolescence. The casual, respectful, and mutually supportive atmosphere among the institute's scientists and staff was established by his example, as was its dedication to excellence in all endeavors. "Adak" was the office nickname for the Aleutian Islands Seismic Network, a prominent project in Carl's research for many of his CIRES years. In 1994, Carl again led the institute as interim director before Susan Avery took office. He retired from active teaching in 1995, but the history book published for this occasion bears witness to his continuing and active involvement in the institute. One of his last official acts was to establish the title of "Fellow Emeritus" of which he, appropriately, is the first.