Providers You Can Trust

Meet Our Team

Meet our renowned team of expert dentists at Foundation Dental Specialists: leaders in advanced dental procedures with a passion for delivering outstanding results.

Meet Dr. Charles

Dr. Allan Charles is a distinguished periodontist with over 50 years of experience providing top-quality periodontal care in Pasadena. A leader in dental education locally and nationally, Dr. Charles is a graduate of the University of Illinois and holds a Certificate in Periodontics from the University of Southern California. He served as an associate clinical professor and director of Junior and Senior Periodontal Clinics during his time at USC and has been a sought-after lecturer at prestigious organizations such as the American Dental Association and the American Academy of Periodontology.

Dr. Charles has been involved in clinically based research, mentored dental interns, and served in leadership roles including Trustee of the American Academy of Periodontology and President of the California Society of Periodontists. He is a pioneer in computer planning for implant surgery, resulting in precise and minimally invasive procedures for optimal patient outcomes. Invited to participate in The Dental Quality Alliance, Dr. Charles's commitment to advancing periodontal care and expertise in the field make him a trusted and respected professional in the dental community.

Meet Dr. Weightman

Dr. Rebecca Weightman, Diplomate to the American Board of Periodontology, is a board-certified specialist in Periodontics and Dental Implant Surgery. Her top priority as a periodontist is to deliver exceptional surgical care in an environment that patients feel comfortable in. As the practice owner of Foundation Dental Specialists, she is committed to bringing together an unparalleled team that will always put the interests of their patients first.

Originally from Buffalo, NY, Dr. Weightman completed her education in Boston, earning her Doctorate in Dental Medicine from Harvard University. She served as the Vice President of her class, Philanthropy chair for the American Student Dental Association – Harvard Chapter, and was recognized for her work improving access to dental care for Boston’s homeless population.

After dental school, Rebecca completed a 3-year residency program to specialize in Periodontics and Dental Implant Surgery at the University of Illinois in Chicago. During that time period, she also earned her Master’s Degree in Oral Sciences through researching the effects of tobacco smoke on oral bacteria.

Since 2015, she has been in private practice as a Periodontist. She is highly experienced in the placement of dental implants and bone grafting, the treatment of periodontal disease and corrective gum therapies. Driven by the highest level of compassion for her patients, she is committed to staying up to date on the latest procedures and technologies designed to improve surgical outcomes and maximize patient comfort.

Dr. Weightman is married to a native of La Cañada and lives in South Pasadena with three curiously busy little children and their adopted lab mix, Dakota. When she’s not with patients or embarking on the adventures associated with owning a dental practice, she enjoys gardening, yoga, and slowing down in nature with her family.

Meet Dr. Lee

Dr. Lee was born and raised in the San Gabriel Valley and attended the University of California, Los Angeles where he received his B.S. in Biochemistry and his Doctorate of Dental Surgery. After spending 8 years in West LA, he decided to venture up to Portland, Oregon and explore the wonders of the Pacific Northwest. He completed his residency at the Oregon Health & Sciences University School of Dentistry to receive his Certificate in Periodontics. Shortly after completing his residency, Dr. Lee obtained his board certification in Periodontics and returned to Southern California, excited to serve the community that he grew up in. 

Dr. Lee focuses on creating individualized treatment recommendations based on the most innovative practices and technologies with proven results. He is always striving to provide the best to his patients and regularly attends continuing education courses on the most relevant topics in periodontics, oral health, and dental research. His dedication to continued learning results in compassionate and excellent care for his patients. Dr. Lee looks forward to improving every patient's health, happiness, and confidence through his work.

Outside of the office, Dr. Lee enjoys spending time with his wife and family. His pastimes include traveling and spending time outdoors, especially on hikes with his forever puppy, Taro. He also loves trying new foods, so if you have any restaurant or recipe recommendations, please let him know!

Meet Dr. Ryan Park

Dr. Ryan Park is a board eligible Periodontist who was born in Ulsan, South Korea but moved and spent his childhood in Toronto, Canada. He moved to California to attend University of the Pacific where he received his B.S. in Biochemistry and his Doctorate of Dental Surgery at their dental school in San Francisco, Arthur A. Dugoni School of Dentistry. He completed his periodontics residency at Columbia University, School of Dental Medicine immediately following dental school. After graduating from residency, he moved to Los Angeles where he has been practicing in multiple private practices. He is excited to have finally found a city he can call home.

Dr. Ryan Park prioritizes providing evidence and biologically driven treatment without compromising patient comfort and needs. He primarily focuses on how to achieve harmony and balance in a patient’s oral health through various periodontal treatments. He loves to connect with people and firmly believes empathy is an essential value to providing meaningful care.

During his free time, he likes to travel, play golf, and tennis (and now pickle ball).

Meet Dr. Limansubroto (Dr. Lim)

Dr. Nerisa Limansubroto, “Dr. Lim,” is a board-certified endodontist of the American Board of Endodontics. She is originally from Jakarta, Indonesia and lived in Singapore for most of her early years. Dr. Lim moved to the States after high school to pursue her dream of becoming a dentist, and completed her Doctor of Dental Surgery degree at the University of California, Los Angeles. After graduating dental school, she wanted to move closer to home so she practiced general dentistry in a multi-specialty hospital clinic in Singapore for two years, where she treated many trauma cases requiring endodontic management, and found her passion in endodontics.

She completed her endodontic specialty training at the University of Washington School of Dentistry, as well as a Master of Science in Dentistry with a focus particularly in regenerative endodontics. She previously practiced in an endodontic specialty office in Visalia, CA where her husband, an LA native, was finishing his Emergency Medicine residency. They have moved back to Los Angeles in 2022 with their daughter and two cats to be closer to family.

Dr. Lim is extremely passionate about saving teeth and will go the extra mile to give teeth a second or third chance. With new technology, 3D imaging, microsurgery and BioCeramic materials, there are very few scenarios where teeth cannot be saved or when a tooth needs both endo and perio treatment - and that is when her Periodontal colleagues step in and collaborate.

When she's not saving teeth, Dr. Lim enjoys singing, playing piano, exploring different cuisines, and traveling - especially to visit her family back in Indonesia.

Meet Dr. Jackson Partin

Dr. Jackson Partin is a board eligible Endodontist who grew up in Santa Cruz County, California, where he enjoyed surfing, long distance open water swimming and Jr.Lifeguards. He received his Bachelor of Science degree in Psychology at the University of Virginia in Charlottesville and returned to the Bay Area to attend dental school. Following in both his parent’s footsteps, he graduated from the University of Pacific, Dugoni School of Dentistry in San Francisco and then traveled to New York to complete a General Practice Residency at St Barnabus Hospital. During this residency he became interested in Endodontics and after a year of private practice returned to the East Coast and completed his Endodontic Post Doctoral Residency at Rutgers University in New Jersey. His primary goal is to provide excellent care to his patients to save their teeth and help them lead healthy lives. Dr. Partin exceeds patients' expectations with his calming personality and gentle approach to their dental treatment. Outside the office, Dr. Partin enjoys traveling, photography and exploring different cuisines.

Newly Minted Retiree

Meet Dr. Morishita

Dr. Wilson Morishita has been a practicing periodontist for 46 years, and is one of the founders of Foundation Dental Specialists. His philosophy has been to "treat patients the way that he would want to be treated," with kindness and compassion.

Dr. Morishita always strives to provide the most up-to-date, evidence-based treatment. He uses all the current technology to be able to provide the best care for his patients. Throughout his career, he has also prioritized the continuing development of local practitioners by hosting study clubs and educating referring dentists, hygienists, and dental assistants in the community.

Dr. Morishita completed his dental education at the University of California, Los Angeles with honors. He received his certificate in periodontics from the University of Southern California. He has been in practice limited to periodontics in Pasadena since 1976.

A Legacy of Excellence

Since our founding in 1974, our practice has prioritized delivering the highest quality of periodontal care and an exceptional patient experience. In 2022, we brought an Endodontist onto the team so that we could better serve our patients with cross-collaborative specialty care. All of our specialists are focused on the support structures of the teeth: the gums, roots of the teeth, bone, and dental implants. Our name, Foundation Dental Specialists, reflects our commitment to making sure your smile is as healthy and strong as possible.


Cone Beam CT (CBCT) technology allows us to get a detailed, accurate picture of your smile so we can better plan your treatment. 

Cutting Edge Technology

Mounted Microscopes

Mounted microscopes are used by our endodontists during root canal treatments to make sure all the infection is removed, and to improve treatment outcomes.

Surgical Excellence

Intraoral Scanners

Using our state-of-the-art intraoral scanners, our doctors are able to get accurate digital, mess-free impressions for implant planning and other treatments.

Intraoral Scanners

Comfortable Treatment Rooms

Foundation Dental Specialists are committed to providing a superior patient experience. From the moment you walk through the door, you will be greeted by a friendly and caring team that prioritizes your comfort and well-being.

Exceptional Patient Experience

Personalized Approach

Foundation Dental Specialists understand that each patient is unique, and they take the time to develop personalized treatment plans tailored to the individual needs and goals of each patient.

Personalized Approach

Free Parking

We believe that the little details are important. You shouldn’t have to spend ten minutes searching for a place to park, and you definitely shouldn't have to pay for it when you find a spot! Our parking lot is located behind the building, off of Hudson Avenue.

Free Parking

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