This document provides a summary of research conducted by GM PACE on the HMI of cars. It includes brand analyses of Cadillac from 1902 to the present. Research methods such as surveys, interviews, and persona development are described. Four personas representing different car owner types are presented, with one persona profiled in detail. The research aimed to understand car owners' lifestyles, needs, and perceptions of luxury cars to inform usability, ergonomics, functionality, and technology in cars.