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Mobile + web developer, trainer, speaker, and writer. He authored 13 books, including Hacking Web Performance by O'Reilly Media and Learn PWA! published by Google. He is a frequent speaker at conferences worldwide and has been widely recognized for his work in the mobile web community. He also authored over 25 web and app development courses at LinkedIn Learning, Pluralsight, O'Reilly Learning, and Frontend Masters. He teaches mobile (Android, iOS), web & PWA, and web performance workshops.