His mother, Judy, operated a small personal agency in Beverly Hills. Her clients included Frank Sinatra, Elizabeth Taylor, Ellen Degeneres, Dr. Dre, D.J. Steve Aoki, Steve Jobs, Jennifer Aniston, and many others. For over twenty years, Judy was entrusted in taking care of their personal lives and homes. Unfortunately, Greg's sister, Lori, was diagnosed with stage four Hodgkins lymphoma and thyroid cancer. Lori survived, and in a chance meeting with Erin Brockovich later came to spearhead a lawsuit against the city of Beverly Hills and Venoco. This case and Lori's struggles gained international media attention and was chronicled in Julia Stoops's book Parts per Million.
