Marek Mularczyk is an Adobe Certified Expert and Instructor. He's also an Adobe Certified Professional and an Adobe Community Professional.
He is an established Adobe Certified Expert and Instructor training across the UK and an author of a very popular video podcast PHOTOSHOP LIGHTROOM TV as well as a YOUTUBE CHANNEL.
He is also an author of video training DVDs: "The Complete Photoshop CC", "The Complete Lightroom CC", "PHOTOSHOP LIGHTROOM TV", "UNLEASH THE POWER OF PHOTOSHOP CS6", "UNLEASH THE POWER OF PHOTOSHOP CS5", and "ADOBE FLASH CS4 NEW FEATURES".
and an author of numerous online classes at Udemy:
as well as 5 books:
Click to check Marek's page on Adobe website.