Dave is a semi-retired software development consultant (writing code and giving advice on processes, tools, etc.), with 36 years of professional experience in a wide variety of languages, systems, frameworks, techniques, domains, etc. He is the T. Rex of Codosaurus, LLC (his one-man consulting firm, which explains how he can get such a cool title, at http://www.Codosaur.us/) near Washington, DC, USA.
His latest passion project is to perfect and spread ACRUMEN, his simple but nearly comprehensive definition of Software Quality. See https://www.codosaur.us/ACRUMEN for details. He is writing a book on it for developers, and another book for recruiters on how to hire developers.
He has spoken at conferences, user groups, etc., about Mutation Testing (the software kind, not biology), ACRUMEN (see above), “gotchas” in the Ruby programming language, some differences between Functional and Object Oriented programming, basic online security, spam prevention, breaking into conference speaking (how meta!), making mead, and many other topics.