Dr. Ruiz achieved his lifelong dream of becoming a physician through public education. After graduating from Coachella Valley High School, Dr. Ruiz graduated magna cum laude from UCLA. He went on to Harvard University, where he earned his Medical Degree, as well as a Masters of Public Policy from the Kennedy School of Government and a Masters of Public Health from the School of Public Health, becoming the first Latino to earn three graduate degrees from Harvard University. He completed his Residency in Emergency Medicine at the University of Pittsburgh and a Fellowship in International Emergency Medicine at Brigham and Women's Hospital. During his training, Dr. Ruiz served as a consultant to the Ministries of Health of both Serbia and El Salvador.

Dr. Ruiz returned home after completing his medical training and began working as an Emergency Room doctor at Eisenhower Medical Center. Recognizing the physician shortage crisis in the Coachella Valley, Dr. Ruiz started a pre-medical mentorship program for young aspiring doctors, which has grown to include over 100 local students.

The program became part of the University of California, Riverside School of Medicine, where Dr. Ruiz served as a Senior Associate Dean. Through the group Volunteers in Medicine, he helped to open a free clinic to help underserved communities in the Coachella Valley.

In 2010, Dr. Ruiz started the Coachella Valley Healthcare Initiative, which brought together stakeholders from across the region to address the local healthcare crisis. He has also worked internationally in the medical community. In 2010, Dr. Ruiz flew to Haiti immediately following the 2010 earthquake and served as the Medical Director for the J/P Haitian Relief Organization. The U.S. Army's 82nd Airborne awarded him the Commanders Award for Public Service for his work.

Dr. Ruiz continued his work as an Emergency Room Doctor until he was elected to the U.S. House of Representatives in 2012. He represents California's 25th District, which includes Imperial County, the Eastern Coachella Valley, and the cities of Banning, Beaumont, Blythe, Hemet, Needles, and San Jacinto. Dr. Ruiz resides in Indio, California and serves on the House Energy and Commerce Committee.