Dave Johnson is the founder of MindSentinel, a Nova Scotia-based startup that is currently developing a “check engine light” mental health app. The app focuses on depression and is prevention-oriented. They are now at the stage in our development where they want to learn about the people in the target audience: individuals who have experienced at least one major depressive episode. David has personally dealt with depression over the past 20 years, with the idea for the app arising out of his own experience.