Roberto is a member of the technical staff at eBay with expertise in compact data structures and algorithms. In 2011 he obtained his MSc. In Computer Science from Universidad Diego Portales in Chile, working on Recommender Systems. He later co-funded SkillupChile, a consumer behavior analysis company. He obtained his PhD from University of Chile in 2016, working on compact data structures with Gonzalo Navarro as his advisor. He received the ‘Capocelli Prize’ from the Data Compression Conference in 2013. His research interests are efficient implementation of large scale IR systems and machine learning.