Santa Monica-based Tsavo Media, the online media startup headed by former Userplane founder Michael Jones, said today that it has hired on Sean Percival as Director of Content at the firm. Percival was most recently at Docstoc, where he was Content Manager, and has also previously headed up social media and search engine marketing at Mahalo. Percival has previously served at Trading Places International and Nova Development. According to Tsavo, Percival will manage the build-out of Tsavo's vertical properties.