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You can use this page to email Joseph Wilk about defmacro.
About the Book
This book explores everything you need to know about Macros and how to write them.
Examples are mainly written in Elixir (http://elixir-lang.org/) but there is also smatterings of Clojure and other languages that do interesting things with Macros.
The Macro concepts explored are useful to to all implementations of Macros.
About the Author
Joseph Wilk works as an Engineer at SoundCloud helping infuse Clojure and Elixir into the organisation.
Blog: http://blog.josephwilk.net
Twitter: @josephwilk