SPO Advisory Corp is a value investing fund founded around 1990 by John Scully, the late William Patterson, and William Oberndorf. Scully has an MBA from Stanford and is also a graduate of Princeton University’s Woodrow Wilson School. His work outside finance includes the Making Waves Educational Program and participation on several Stanford boards. SPO is most famous for an investment in Plum Creek Timber in the 1990s. It tends to hold a very concentrated portfolio; according to our database, over half of its invested capital was in only four stocks.