Denny Lee is a Principal Program Manager at Microsoft for the Azure Cosmos DB team - Microsoft's globally distributed, multi-model database. He is a hands-on distributed systems and data sciences engineer with extensive experience developing internet-scale infrastructure, data platforms, and predictive analytics systems for both on-premise and cloud environments. Prior to joining the Azure Cosmos DB team, Denny worked as a Technology Evangelist at Databricks; he has been working with Apache Spark since 0.5. He was also the Senior Director of Data Sciences Engineering at Concur, and was on the incubation team that built Microsoft's Hadoop on Windows and Azure service (currently known as HDInsight). Denny also has a Masters of Biomedical Informatics from Oregon Health and Sciences University.