Petter Mostad is associate professor in mathematical statistics at Chalmers University of Technology in Sweden. After graduating from Princeton with a PhD in pure mathematics, his interests have expanded in several directions and now focus on Bayesian inference and modeling, with forensic genetics as an important area of application. He initiated the implementation of the precursor of the Familias program in 1995, and has together with Thore Egeland and later Daniel Kling developed Familias, which is now one of the most used programs world-wide in the area of relationship inference based on DNA data.