The present invention provides for a method of producing one or more fatty acid derived compounds in a genetically modified host cell which does not naturally produce the one or more derived fatty acid derived compounds. The invention provides for the biosynthesis of fatty acid derived compounds such as C18 aldehydes, C18 alcohols, C18 alkanes, and C17 alkanes from C18-CoA which in turn is synthesized from butyryl-CoA. The host cell can be further modified to increase fatty acid production or export of the desired fatty acid derived compound, and/or decrease fatty acid storage or metabolism.
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 The invention described and claimed herein was made utilizing funds supplied by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The government has certain rights in this invention.