I've sold over 40,000 non-fiction books on Amazon and made over $160,000 in six years while writing on the side.

I have a full-time job and three young sons; I can't spend 40 hours a week writing. This article describes my journey.

I write mainly tech books:

Thanks to my readers, many wrote positive evaluations. Several are bestsellers.

A few have been adopted by universities as textbooks:

My books'