Edmund R. (Gus) Gustason is a senior geologist and geoscience advisor with Enerplus Resources (USA) Corporation in Denver, Colorado. Gus received his BS Geology from Humboldt State University and his MS Geology from Northern Arizona University. He moved to Boulder, Colorado in 1981 to join Dr. Erle Kauffman’s Cretaceous Attack Team (CATs) at the University of Colorado. Dr. Kauffman (advisor) and Dr. Thomas Ryer were instrumental in directing his PhD research on the Dakota Formation of southern Utah. Gus worked as a geologist for RPI International during the 80s while he continued his research on the Dakota; eventually receiving his PhD from CU Boulder in 1989. He then worked for BP Alaska, Schlumberger Reservoir Technologies, EnCana, El Paso and, now Enerplus. Gus is particularly interested in core- and outcrop-based facies analyses and sequence stratigraphic evaluations of oil- and gas-producing formations. He has more than twenty years of experience with exploration, appraisal and development of conventional reservoirs and more than ten years of experience evaluating and developing unconventional shale gas plays (e.g., Marcellus and Utica in Appalachian Basin and Niobrara in several Rocky Mountain basins) as well as tight gas sandstone plays (e.g., Williams Fork in the Piceance Basin, J and Codell sandstones in the Denver Basin, and Almond Formation in the Greater Green River Basin). He also teaches a graduate-level course on core facies analysis at CU Boulder. Gus is a long-time member of AAPG, SEPM, GSA, SPWLA, and IAS.