What type of writing samples did you submit?

[kotov]

I used a 15-page essay that I had written the semester prior to writing my thesis (most of my applications were due before my thesis was done). It was tangentially-related to my thesis topic though (and I ended up giving it as a conference paper later on).

[dr. t]

I used an article I had presented, submitted, and received feedback on, but not yet published.