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Peter Armstrong is the co-founder of Leanpub. Peter coined the term "lean publishing" to describe the act of self-publishing an in-progress ebook. He has written a manifesto about lean publishing, and is writing an in-progress ebook called Lean Publishing about it. Leanpub was founded based on the principles in this manifesto.

Besides writing three books, Peter has over a decade of experience as a software developer, with 8 years of experience doing software development at Silicon Valley startups before founding his own consulting company, Ruboss, in 2008. Peter wrote and self-published Flexible Rails from 2006 to 2007, which rose to #73 all-time by revenue on Lulu before becoming a Manning book, being translated into multiple languages and serving as the inspiration for the Ruboss framework (now the RestfulX framework). Peter's second book, Hello! Flex 4, pioneered the format of Manning's Hello! series.

Peter is a frequent speaker about lean publishing and startup entrepreneurship. He lives in the Vancouver, BC area with his wife and son. Besides writing, he enjoys snowboarding and playing StarCraft 2.