Excessive stress can decrease office workers' productivity and negatively impact overall health. This project aims to predict office workers' stress levels using physiological and behavioral markers based on heart rate, skin conductance, skin temperature, and acceleration. Building on knowledge and models developed for student populations in the SNAPSHOT study and collecting new data from worker populations, we plan to improve stress-level prediction performance for office workers. Furthermore, we will also study how to improve productivity by decreasing stress. In order to accomplish this, we will look for causal factors that increase stress and possible interventions that can be deployed to office workers to decrease these factors.