Thank you everyone for writing in – this has been a great discussion! I hope to be able to revisit the conversation later this week. If you are interested in learning more about my work please follow me on Twitter @garjoh_canuck, on LinkedIn, or visit my website for links to my research https://www.garjoh.com.

I’m Garrett Johnson, an Assistant Professor of Marketing at Boston University's Questrom School of Business. My research on Internet marketing examines online display advertising: the medium’s effectiveness and privacy issues. My ad effectiveness research uses large-scale experiments to measure how and how much ads work. My privacy research quantifies the value of online behavioral targeting to industry and considers the impact of policy & self-regulatory approaches. I work with Internet companies—including Google and Yahoo!—to answer these questions with Internet-scale data.

Ask me anything about: - Why and how exactly do ads track you online? - What are browser cookies? How are they used? - How effective are online display ads? - Why and how should you run experiments to measure the effects of online ads? - What is the economic impact of the EU's General Data Protection Regulation (GDPR)? - What is the future of online advertising without browser cookies? - What was the impact of the 2020 YouTube settlement (i.e., the "COPPAcalypse") on made-for- kids content?

Proof: Here's my proof!