Chamira Priyamanthi Nawarathna received a course certificate from Johns Hopkins University dated June 30, 2016 for successfully completing the online course "The Data Scientist's Toolbox" offered through Coursera. The certificate was authorized and signed by Jeff Leek, Roger Peng, and Brian Caffo of the Department of Biostatistics at the Johns Hopkins Bloomberg School of Public Health and can be verified through Coursera.