John Miller is an American businessman and attorney best known as the chairman of Cali Group and CEO of PopID.
He founded Cali Group in 2011 and drew wider attention after he began dating actress Jennifer Garner.
Who is John Miller?
John C. Miller grew up in Los Angeles and trained as a lawyer. Today he chairs Cali Group and leads PopID, a facial recognition payment company. Miller founded Cali Group in Pasadena in 2011.
Cali Group invests in technology for the restaurant and retail industries. Its portfolio includes CaliBurger, Miso Robotics, and Super League Gaming.
Miller has led PopID as CEO since 2018. His Wikipedia profile lists both companies as his main business roles.
Jennifer Garner’s Boyfriend John Miller
Jennifer Garner is dating John Miller, and the two have been linked since 2018. Garner is the Alias actress who has three children with ex-husband Ben Affleck: Violet, Seraphina, and Samuel.
The couple first went public in October 2018. That same month, Garner finalized her divorce from Affleck.
Miller and Garner then dated from mid-2018 until early 2020, and they restarted the relationship in April 2021. They have stayed together since then.
Photographers have caught the pair together many times. In October 2024, they held hands outside Garner’s Brentwood home, and on April 25, 2025, they wore matching blue outfits in New York City.
Garner and Miller walked their dogs in Brentwood on August 9, 2026. Engagement talk grew that month after Garner wore a large diamond ring. Even so, neither has publicly confirmed an engagement.
Over Labor Day weekend in September 2026, photographers caught them sharing a hug during a casual outing. The couple has rarely spoken publicly about their relationship.
Early Life of John Miller
John Miller grew up in Los Angeles, California. He built his early path around law and business, first at the University of Redlands and later at Stanford.
His career began in intellectual property law. Miller spent six years at Arrowhead Pharmaceuticals, from 2004 to 2010, before he founded Cali Group.
That experience gave him a base in technology and deal-making. He graduated Order of the Coif from Stanford Law School.
John Miller Age / Birthday
John Miller was born in 1978 and is in his late 40s as of 2026. He has led Cali Group for 15 years since he founded it in 2011.
John Miller Ethnicity and Nationality
John Miller is an American. He grew up in Los Angeles, California, and built his business career in the Pasadena area.
John Miller Education
Miller earned a bachelor’s degree in economics from the University of Redlands. He then enrolled at Stanford Law School and earned a Juris Doctor.
He graduated Order of the Coif, an honor society for top law graduates. After law school, Miller gained admission to the California Bar.
That legal training shaped his first job in intellectual property. He co-authored a handbook on nanotechnology law, published in 2005.
John Miller Career
Early Career and Arrowhead (2004-2010)
Miller began his working life as a lawyer with a focus on intellectual property. From 2004 to 2010, he served as vice president of intellectual property at Arrowhead Pharmaceuticals.
He also co-authored The Handbook of Nanotechnology: Business, Policy, and Intellectual Property Law.
The book explores the commercial side of nanotechnology. Ruben Serrato, Jose Miguel Represas-Cardenas, and Griffith Kundahl wrote it with him, and John Wiley & Sons published it in 2005.
Cali Group and CaliBurger (2011-Present)
After Arrowhead, Miller founded Cali Group in Pasadena in 2011. The holding company invests in technology for restaurants and retail. Miller served as CEO of CaliBurger from 2012 to 2014.
In 2012, In-N-Out Burger sued CaliBurger over menu items and cup designs. The two sides settled out of court, and CaliBurger agreed to change its menu and decor.
CaliBurger serves West Coast style burgers, fries, and milkshakes. In 2017, Miller told Fox News that kitchen robots improve food consistency and hygiene. L
ater, in 2020, he announced body thermometer devices at the CaliBurger store in Pasadena because of COVID-19.
Cali Group’s May 2026 portfolio lists CaliBurger, Miso Robotics, Super League Gaming, PopID, Antler, Kolo, Simon, and Gatler Robotics.
Miso Robotics and PopID (2016-Present)
Miller co-founded Miso Robotics in 2016 with Buck Jordan and other partners. CaliBurger served as the first testing ground for its Flippy kitchen robot. A Flippy robot arrived at Dodger Stadium in 2018.
Miso unveiled Flippy 2.0 in 2020, and White Castle installed it in 100 locations in 2022. That same year, Time magazine named it one of the best inventions of 2022. Miller has served as PopID CEO since 2018.
PopID runs a facial recognition payment system for restaurants and retail. It has partnered with Whataburger and J.P. Morgan Payments, and it appeared at the 2022 FIFA World Cup in Qatar and the Miami Grand Prix.
In April 2024, Steak n Shake became the first national restaurant chain to roll out PopID biometric check-in in all stores. In 2020, Nation’s Restaurant News added Miller to its Power List.
John Miller Ex-Wife and Children
Miller married violinist Caroline Campbell in April 2005. He filed for divorce in June 2011, but the couple reconciled the following February. They filed divorce papers again in October 2014.
In October 2016, Miller and Campbell agreed to joint legal custody of their two children.
A daughter named Violet and a son named Quest make up their family. Their divorce became final in November 2018.
Campbell is a concert violinist, and Miller has kept his family life largely out of the public eye. Since 2018, his best-known personal story has been his relationship with Jennifer Garner.
John Miller Net Worth
John Miller’s estimated net worth is $20 million as of 2026. His income comes mainly from Cali Group and PopID. He founded Cali Group in 2011.
Miller also holds a co-founder role at Miso Robotics, which grew out of his work at CaliBurger. Cali Group itself holds stakes across restaurant, retail, and gaming technology companies.
Miller spent six years as an intellectual property executive before he turned to business.
Conclusion
John Miller moved from intellectual property law at Arrowhead to building Cali Group, PopID, and the kitchen robot company Miso Robotics.
His relationship with Jennifer Garner, which resumed in April 2021, keeps him in the news even though the couple rarely speaks about it.