Meet Our Team
Dr. Alexander and Dr. Cho feel very lucky to have a trusted team of employees who care so much about patient satisfaction. Each member of our dental team practices a high level of quality service toward all patients. We perform our skills with respect, efficiency, and patient education in mind, and we have genuine concern for the total health of all who enter into the office for care. From our dental family to yours, we welcome you! If you would like to learn more about our dental care practice in Santa Ana, California, or you would like to schedule a consultation with our dentists, please feel free to contact us at MacArthur Family Dental today.

Tom Alexander, DDS

Dr. Alexander grew up in Southern California and attended the University of Southern California, earning a Bachelor of Science Degree. He then went on to graduate from the prestigious University of Southern California, Ostrow School of Dentistry, receiving his DDS degree. His initial dental practice was in Carmel, California, but was drawn back to Southern California by family and friends. Raising two children and happily married to his wife, who is a dental hygienist, Dr. Alexander looks forward to his day-to-day contacts with patients, and he also enjoys hiking, golfing, and traveling. As an accomplished provider of fine dentistry, Dr. Alexander knows that establishing trust through honest discussion leads to long lasting and mutually satisfying professional and personal relationships. His concern and studies about the connection between a healthy mouth and a healthy body have placed him as a leader in his profession and a valuable source of information for his patients. Skill and compassion go hand in hand when providing exceptional patient care. As a dental professional, he stays up to date on the latest advancements in dentistry in order to provide the most current treatment options for his patients. As a doctor, he recognizes that his patients are unique individuals who have placed a great deal of trust in him and his team. That is just one reason why he values each and every patient relationship. He appreciates the time you have taken to visit this site and find out more about this dental practice, the team, and the many services we can provide to help you achieve optimum oral health.
Contact Dr. Tom Alexander Directly at:

Eric Cho, DDS, Periodontal Specialist

Eric Cho is currently the Clinical Associate Professor at the Ostrow School of Dentistry of University of Southern California, Department of Advanced Periodontology. He holds a DDS degree from USC School of Dentistry. He began his career and trained as a periodontist at USC where he specialized in periodontics and implantology. He is known for his precise and conservative treatment and his caring and gentle approach to patient care. In addition to working with Dr. Alexander and the MacArthur Family Dental team, Eric also has a private practice in Beverley Hills, California. Eric is a member of several dental associations, including American Academy of Periodontology, California Dental Association, American Dental Association Los Angeles, Pierre Fauchard Academy, and the Beverly Hills Academy of Dentistry. He has lectured extensively on reconstructive and implant surgeries, bone and soft issue grafting, and periodontics at various meetings both nationally and internationally. Dr. Cho is married and has two young boys.

Christina McDonald – Office Manager

Christina, our office manager, has been in the field of dentistry for over 28 years and is our resident expert on all things related to insurance and billing. Christina works in our front office, greeting patients with her beautiful smile. She underwent full mouth reconstruction at 35yrs of age and says you’re never too old to improve your smile. She loves to interact with patients and is all about service. She definitely goes the extra mile! She also goes over all treatment and financing options for our patients as well. Any questions; she’s happy to help answer. Christina and her husband, Jim, are proud pet parents to Gilbert, their Golden Retriever, the best dog in the world! Gilbert loves to take them on walks and Christina loves Spinning classes, cooking and wine.
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Zulma Vargas-Sanchez – Front Office

Zulma is new to the dental world. She started out as one of our patients and liking her experience, went to school to learn the workings of the front office. After doing an internship with us, Zulma now works to help Christina with phones, insurance and patient care. She recognizes the importance of having a healthy mouth and is excited to be part of helping patients achieve that for themselves. Zulma is a sweetheart and is eager to help our patients in getting the help they need. Zulma, Jose and their two boys love to play in the park. Family time is important and they do lots of outings together like bike riding and hiking.
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Mary Kay Alexander – Registered Dental Hygienist

Mary Kay has been a registered dental hygienist for 27 years. She was born and raised in the state of Montana and she did her schooling there before moving to California in 1986. She has lived in Carmel, Pasadena, Rancho Palos Verdes, and now Irvine. She has worked in a variety of dental practices: general dentistry, periodontics (gum disease and surgery), TMJ specialist (temporomandibular joint pain), orthodontics (braces/Invisalign®) and with sleep apnea. Mary Kay brings with her a vast experience of knowledge and training. She is gentle and caring and likes to think outside the box in finding solutions for patient’s needs and concerns. She is a strong advocate for patient’s health. Her focus is to help patients make the connection between a healthy mouth and a healthy body as science continues to show us how it is related to heart disease, diabetes, and high blood pressure and other diseases. She stays up to date with trending dental discoveries and methods through regular continuing education courses. Mary Kay is married. She loves to swim, hike, read, and enjoy good wine! She and her husband enjoy traveling as well.
Contact Mary Kay directly at:

Jazmina Haros – Dental Assistant

Jazmina, affectionately called Jaz by her friends and our dental family, has been in California for 19 years. She began her dental career 14 years ago working at the front desk and was eager to learn what happened in the back office. She got her chance when her doctor’s assistant called in sick, and she has been a dental assistant ever since. Currently she is studying to become a registered dental assistant, which will allow her to do more procedures with the doctor and on her own in the office. Just one more test to go before she has that training under her belt! Family is everything to Jaz, whether it’s with her own family or here with our family of patients at MacArthur Family Dental. She says patients are like extended family and she enjoys looking after them and meeting their needs. Jaz is bi-lingual and is an asset not only to our Spanish speaking patients, but her kind and gentle manner helps put all our patients at ease. Jaz is married with two young boys who keep her busy. She loves spending time with her family and working out on the weekends. She also enjoys swimming, listening to music, and dancing.
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