The specialists.

Dr. Jönsson grew up in Salt Lake City, Utah, where his father — a general dentist — introduced him to the satisfaction of helping patients through dental care. He earned his undergraduate degree in Medical Biology at the University of Utah before attending the University of the Pacific Arthur A. Dugoni School of Dentistry, graduating in 2001 with high honors and membership in the Omicron Kappa Upsilon and Tau Kappa Omega dental honor societies.

After a period in general dentistry in San Francisco, Dr. Jönsson pursued specialty training in endodontics at the University of Illinois at Chicago, earning his MS in Oral Biology in 2005. He subsequently completed a fellowship in implant dentistry at Loma Linda University (2008–2010) and received training in IV sedation, broadening his ability to serve complex cases and anxious patients.

Dr. Tatosian was born in St. Louis, Missouri, and has been in private practice in Mission Viejo since 1992 — making him one of the longest-established endodontists in the region. He earned his BS in Chemistry from the University of Missouri–St. Louis before completing his dental degree at the University of Missouri–Kansas City School of Dentistry.

Following a General Practice Residency at the VA Hospital in Kansas City and five years of combined general dentistry practice and faculty work at Washington University in St. Louis, Dr. Tatosian completed his endodontic specialty training and MS at the University of Texas Health Science Center in Houston. He holds an adjunct faculty appointment at the USC Herman Ostrow School of Dentistry.

Dr. Chu grew up in San Diego, California, and earned his BS in Neurobiology at UC Berkeley before attending the UCLA School of Dentistry, where he received the Outstanding Performance in Endodontics Award. During dental school he participated in a community service trip to China providing dental care to underserved populations.

He completed his endodontic residency at the University of Washington, earning his Master of Science in Dentistry (MSD), and returned to Southern California to join the Saddleback Valley Endodontics team. Outside the office, Dr. Chu is a former nationally ranked junior tennis player and remains active in pickleball, basketball, rock climbing, golf, board games, and escape rooms.