Meet Our Doctors

Originally from Australia, Dr. Witherspoon embarked on his journey in dentistry at the University of Queensland, earning dual degrees: a Bachelor of Dental Sciences and a Bachelor of Economics. His early career took him through five years of General Dentistry in Australia and the United Kingdom. Seeking further specialization, he pursued advanced training at Baylor College of Dentistry, where he obtained a Certificate of Advanced Specialty Training in Endodontics and a Master of Science in Oral Biology in 1996-1997.

During his tenure at Baylor from 1996 to 2001, Dr. Witherspoon not only thrived as full-time faculty but also contributed as assistant director of the graduate endodontic program. Today, he dedicates himself to endodontic practice while enriching the next generation of dentists. Beyond dentistry, his assion for learning led him to complete a Master of Fine Arts at the University of Texas at Dallas in 2013, adding a creative dimension to his professional journey.

• President’s Award American Association of Endodontists (AAE) 2015 (Bestowed only 10 times in AAE history)
• Diplomat of the American Board of Endodontics 2003-present
• Lifetime member of the College of Diplomats American Board of Endodontists
• Fellow of the International College of Dentists 2013-present
• General Chair for the American Association of Endodontists annual meeting 2015 Program
• Chair for the American Association of Endodontists annual meeting 2014
• Program Vice Chair for the American Association of Endodontists annual meeting 2013
• Workshop Chair for the American Association of Endodontists annual meeting 2007-2011
• Chair for Table clinics American Association of Endodontists annual meeting from 2001-2003
• American Association of Endodontists annual session planning committee 2001-2003, 2007-2016
• Research and Scientific Affairs Committee American Association of Endodontists 2000-2003
• Edward M. Osetek Educator Award. American Association of Endodontists 1999
• Omicron Kappa Upsilon Honor Dental Society – Faculty Member – elected 2000
• Co-author of the chapter on the Diagnosis in The Guidebook to Molar Endodontics 2016
• Co-author of the chapter on Management of Teeth with Necrotic Pulps and Open Apices in Mineral Trioxide Aggregate: Properties and Clinical Applications
• Co-author of the surgery chapter in the ninth and 10th ed. of Pathways of the Pulp
• Co-author of the obturation chapter in the seventh and eighth ed. of Pathways of the Pulp
• D-Magazine Best Dentist in Dallas 2003-2019
• Texas Super Dentists by Texas Monthly in 2005-2019
• Published over 30 articles in peer reviewed journals
• Lectured world wide
• Journal reviewer
• Quintessence International
• International Endodontic Journal
• Journal of Endodontics
• JADA
• Past-President of the Southwest Society of Endodontics
• Past-President of the DFW Metroplex Endodontic Society
• Avid swimmer, usually swimming in the Swim Across America event each year

Originally hailing from Dublin, Ireland, Dr. Regan completed his dental career at Trinity College in Dublin. After eight years practicing general dentistry in London, he pursued advanced studies at the Institute of Dental Surgery, Eastman Dental Hospital from 1998 to 1999, earning a Master’s in
Restorative Dentistry from the University of London.

In 1995, he relocated to Dallas, Texas, where he completed his education at Baylor College of Dentistry in 1998. There, he obtained a Certificate of Advanced Specialty Training in Endodontics and a Master of Science in Oral Biology. With a strong commitment to education, he served as a faculty member at The Institute of Dental Surgery, Eastman Dental Hospital, and later as fulltime graduate faculty and Interim Director of the graduate endodontic program at Baylor from 2001 to 2005.

Today, he practices endodontics full-time and holds the position of adjunct faculty at Texas A&M Baylor College of Dentistry.

• Diplomat of the American Board of Endodontics 2003-Present
• Lifetime member of the College of Diplomats American Board of Endodontics
• Fellow of the International College of Dentists 2013-present
• Workshop Chair Designate for the American Association of Endodontists annual meeting 2016-2018
• Co-author of the chapter on the Diagnosis in The Guidebook to Molar Endodontics 2016
• Co-author of the chapter on Surgical Endodontics in Harty’s Endodontic Textbooks in 2003 and 2010
• Co-author of the chapter on Canal Preparation in in Harty’s Endodontic Textbooks in 2003 and 2010
• Co-author of the Surgery chapter in Mosbys Endodontic Textbook (Stock, Walker, Gulabivala) 2004
• Author of the Root canal system obturation chapter in Mosbys Endodontic Textbook (Stock, Walker, Gulabivala) 2004
• D-Magazine Best Dentist in Dallas 2005-2019
• Texas Super Dentists by Texas Monthly in 2005-2019
• Published approximately 25 articles in peer reviewed journals
• Lectured in the UK, France, Ireland, Mexico and the US
• He reviews articles for several Dental journals including:
• He is a member of the American Dental Association®, the Texas Dental Association, the Dallas County Dental Society, the American Association of Endodontics, the Dallas Forth Worth Metroplex Endodontic Society

In his free time Dr. Regan likes to cook, read, exercise and is an amateur photographer. He is married to Deborah, who is the Director of Undergraduate Periodontics at Baylor College of Dentistry. They have two sons named Conor and Killian. Their family dog is a yellow labrador named Luci.

Dr. Tam completed a Bachelor of Science in Cell Biology and Genetics from the University of British Columbia. Her passion for dentistry led her to earn her DMD from Boston University Henry M. Goldman School of Dentistry in 2003, where she also achieved a Master of Science in Dentistry and a Certificate of Advanced Graduate Study in Endodontics by 2006.

With a rich background in both Boston and Vancouver, Canada, Dr. Tam has made significant contributions as the former Undergraduate Director of Endodontics at the University of British Columbia Faculty of Dentistry from 2010 to 2013. Currently, she serves as a part-time Clinical Assistant Professor at Texas A&M University Baylor College of Dentistry in the Department of Endodontics. Her expertise extends beyond academia; Dr. Tam is a published author in the esteemed Journal of Endodontics and is renowned for her engaging lectures, delivered both locally and internationally.

Dedicated to advancing her field, Dr. Tam is an active member of several professional organizations, including the American Association of Endodontists, American Dental Association, Texas Dental Association, Dallas County Dental Society, and Greater DFW Endodontic Society. She is also honored as a Fellow of the Royal College of Dentists of Canada.

Beyond her professional achievements, Dr. Tam finds joy in family life with her husband, Kenny, and their two children, Zachary and Sophia. Her passions include: yoga, Pilates, exploring new cuisines and traveling.

• Bachelor of Science in Cell Biology and Genetics from the University of British Columbia (1999)
• DMD (Doctor of Medical Dentistry) at the Boston University Henry M. Goldman School of Dentistry (2003)
• Undergraduate Director of Endodontics at the University of British Columbia Faculty of Dentistry (2010-2013)
• Clinical Assistant Professor at the Texas A&M University Baylor College of Dentistry (Current)
• Part-time instructor in the Department of Endodontics at Texas A&M College of Dentistry (Current)
• Published author in the Journal of Endodontics

Originally from Spain, Dr. Antonio Berto completed his dental training in Madrid, earning his Bachelor of Dental Surgery (B.D.S.) degree in 2005.
After working one year as a general dentist, he decided to pursue further specialization and became a Fellow in the Department of Endodontics at Texas A&M Health Science Center Baylor College of Dentistry in 2006, where he also obtained his Certificate of Advanced Specialty Training in Endodontics in 2009.
After graduating, Dr. Berto served as Director of Endodontic Curriculum at the Advanced Education of General Dentistry from 2009-2015 and also served as Assistant Professor in the Department of Endodontics.
Today, he practices endodontics full-time while continues lecturing both nationally and internationally.

• Fellow in the Department of Endodontics Texas A&M Health Science Center – Baylor College of Dentistry 2006.
• Fellow of the International College of Dentists 2018- present.
• Workshop Chair Designate for the American Association of Endodontists annual meeting 2019-2023.
• D-Magazine Best Dentist in Dallas 2009-present
• Texas Super Dentists by Texas Monthly in 2009-present
• Published over 20 articles in peer reviewed journals
• Lectured in in more than 100 national and international dental meetings.
• American Association of Endodontists annual session planning committee 2019-2023.
• Rodriguez Carvajal for the best clinical case published in the Spanish Association of Endodontics official Journal in 2013.
• First place on Gutta-core Challenge, for the best clinical case.
• His research on Physical and Chemical Properties of New-generation Endodontic Materials received a grant from the American Association of Endodontics and was presented in Orlando at the Annual meeting of the American Association of Endodontics and also in the DFW Metroplex Endodontic Society.
• Past-President of the Southwest Society of Endodontics.
• Past-President of the DFW Metroplex Endodontic Society.
• Past-President of the North Texas Hispanic Dental Association.
• Member of The American Dental Association, The Texas Dental Association, The Dallas County Dental Society, The American Association of Endodontics, The Dallas Forth Worth Metroplex Endodontic Society.
• He is married to Michelle and has 3 kids, Antonio, Ana, and Rafael.
• Out of the office, Dr. Berto enjoys spending time with his family, travelling and playing and watching sports.