A Khanversation with...analytics whiz Tony Liu
There are those people you meet in life, and you know they are just really nice. They listen patiently, they are very thoughtful, and seem like they can be anyone's friend. Tony Liu is one of these people.
So, when I started researching for our Khanversation, I was fascinated that I knew his polite, easy-going personality, and had never heard a hint at the genius within. I might have guessed that this MIT grad is pretty great at analytics since he's one of the small handful of people on Khan Academy's analytics team trying to ensure that world can learn more effectively. However, I might not have realized that he worked for Richard Rusczyk on the Art of Problem Solving. I would never have guessed that he got a perfect score on the AIME, the qualifying exam for the USA Math Olympiad; or that he received an honorable mention at that olympiad, and twice was honorably mentioned at the Putnam (another really, really famous math competition). Oh, and he made the world finals team for the ACM International Collegiate Programming Contest. No biggie.
Tony's probably already blushing from me mentioning these things, so I will not continue on with the long list of accolades...except to say that he also runs marathons, plays the piano and violin, and does origami. I stopped believing he was a real human being a few hobbies ago. Oh, and did I mention he does break dancing? We're eagerly awaiting this year's talent show to see Tony strut his stuff...
In case you, too, don't believe he's real, here's a picture of Tony. I also pinched him to ensure I wasn't talking to a hologram.
Side note: Tony notes that he runs half-marathons. No false claims from this guy.
So, what is your background? How did you find your way to Khan Academy?
I grew up in the Chicago suburbs and went to the same high school as Stephanie - after that, I went to MIT and got the exact same degrees as Sal - and now I’m here! Must be destiny, I know. Anyway, I spent a couple years working in the secretive world of high-frequency trading. That was fun, but I’ve always wanted to understand how people learn. I taught classes for math olympiads and I’ve been fascinated by the “aha!” moment when you understand a new idea.
Speaking of learning, that’s mostly what I’ve been doing at Khan Academy on the data science team. Well, learning about learning - I’ve been working on metrics to help us understand if changes we make to the site translate to users learning more over time. There are a lot of forces at play, many of which are actually psychological in nature. It’s been an interesting journey so far.
You seem pretty good at programming...how did you get started?
I was really into math competitions back in high school and I signed up for TopCoder my senior year since a lot of the same people were participants. I jumped into my first competition not really knowing how to program and not knowing what a “class” was. Yet, all the problems asked you to “write a class that does X” in order to solve the problem. Needless to say, I didn’t even come close to getting any of the questions right. That probably wasn’t the best way to start in retrospect, but it really motivated me to get better.
The nice part about most programming contests is that you can learn from everyone else’s code afterward! The not-so-nice part is that I saw some pretty obfuscated C++ code as a first-timer, with lots of macros, gcc-specific extensions such as “a <?= b”, etc, you name it...
How has your KA experience been so far?
It’s been great. Khan Academy is by far the most open environment I’ve worked in. At a personal level, I’ve always optimized for a combination of “how interesting is the work?” and “how much am I learning?”. Khan Academy is at the perfect sweet spot.
Now that I've embarrassed you by outing all your hobbies and accolades, what's something random you'd actually like to share about yourself?
Oh, I designed a shirt for the Chicago-area ARML team back in 2006. We had 50+ people wearing it! I put this on my college application too, so maybe this is what got me into MIT. This would have been perfect for my Khan Academy application, but I totally forgot about it when I was applying!
Seems pretty appropriate.










