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Smith has served in numerous energy policy positions for both the United States federal and Oklahoma state governments , including Assistant Secretary of Energy for Fossil Energy under President George W. Bush ( 2002 – 2004 ) and Oklahoma Secretary of Energy under Governor of Oklahoma Frank Keating ( 1995 – 2002 ) .
 Oklahoma, Energy, Energy, George W. Bush, Oklahoma, Energy, Oklahoma Frank Keating
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oklahoma, Energy, Energy, George W. Bush, Oklahoma, Energy, Oklahoma Frank Keating