Mobile sensing is increasingly becoming part of everyday life due to the rapid evolution of the mobile phone into a powerful sensing platform. Popular consumer smartphones are now equipped with the necessary sensors to monitor a diverse range of human activities and commonly encountered contexts. The technical challenges of mobile sensing have attracted interest from various research communities, such as experts in machine learning, human computer interaction and mobile systems, who approach this emerging field with their own perspective due to differences in their interests and expertise. Progress within mobile sensing can be accelerated by increased cooperation and interaction between the different communities. This workshop seeks to provide a forum for a broad cross-section of mobile sensing researchers with diverse technical backgrounds to discuss key challenges and opportunities in mobile sensing research. We invite the submission of short position papers with multi-disciplinary perspectives on mobile sensing along with longer technical papers that represent the latest innovations in the field.