Most recently DJ was appointed by president Obama to be the first US chief data scientist, where his efforts led to the establishment of nearly 40 chief data officer roles across the federal government. He also established new health-care programs including the Precision Medicine Initiative and the Cancer Moonshot, new criminal justice reforms including the Data-Driven Justice and Police Data Initiatives that cover more than 94 million Americans, as well as leading the national data efforts. In industry, he led the product teams at RelateIQ which was acquired by Salesforce, was founding board member for Crisis Text Line which works to use new technologies to provide on demand mental and crisis support, and was a member of the venture firm Greylock Partners. He has also was Chief Scientist, Chief Security Officer and Head of Analytics and Data Product Teams at the LinkedIn Corporation where he co-coined the term Data Scientist. He has also held a number of roles at Skype, PayPal, and eBay.