Meet The Team

Our Offices

You work hard every day to keep your family smiling and we want to be a part of that mission! As your local Philadelphia, PA orthodontists, our team is proud to offer comprehensive orthodontic services that are convenient, comfortable and cost-effective. Our goal is to help you and your family maintain a happy, healthy smile for years to come.

Evan Tran, DDS

Trapped in a young man’s body with a wise man’s brain, Dr. Evan Tran considers himself to be a great listener. To this end, Dr. Tran strives to understand his patients’ treatment goals and works with them to thoroughly explore how to achieve them. As a native Florida Gator, he chomped his way through The Big Apple for dental training at Columbia University. Not long after, he completed his orthodontic training at Seton Hill University in the small town of Greensburg, Pennsylvania. It was here, that he added the hobby of blacksmithing to his repertoire which also includes skiing, water sports, and computing. In 2016, Dr. Tran moved to Philadelphia to join Rich Orthodontics. He looks forward to meeting you and wants you to know that he will do his best to give you the smile you deserve!

Sarah Prehn, DDS

Dr. Sarah Prehn is originally from Kingston, NY. Her mother worked as a dental assistant, and after shadowing her in high school at the office, she knew she wanted to be a dentist. Dr. Prehn completed her undergraduate degree at the State University of New York at New Paltz. She then went on to graduate with a Doctorate of Dental Surgery from New York University as the top woman in her class, and obtained her Orthodontic Certificate from Saint Barnabas Hospital in Bronx, NY. After residency, Dr. Prehn became a Diplomate of the American Board of Orthodontics. To further her dental knowledge, Dr. Prehn attends conferences and courses throughout the year. Her most recent coursework includes completing an advanced fellowship in clear aligner treatment. Dr. Prehn is also a member of the American Association of Orthodontics, Omicron Kappa Upsilon Dental Honors Society, the American Dental Association and the Pennsylvania Dental Association.

When asked why she chose orthodontics as her profession, Dr. Prehn said: “Practicing orthodontics allows me to help people in many ways. Some people seeking treatment are unhappy with the position of their teeth and want to straighten them for aesthetic purposes. For these patients, giving them the smile of their dreams gives them self-confidence. Other people are looking to correct more serious problems that affect eating, speaking and tasks that help them function in life. Whether their problem is mild or severe, it is so rewarding to see patients walking out of the office feeling happy about their treatment.”

Dr. Prehn now lives in Wynnewood, PA with her husband, Joseph and her kitten, Maisie. When she isn’t working, you can usually find her outside running. Her other favorite pastimes include going to musical concerts, traveling, reading and spending time with friends and family. Dr. Prehn is a singer and plays the trombone and piano. In addition to her work in the office, Dr. Prehn volunteers her time at local health fairs, performing dental screenings and teaching people about keeping their teeth healthy. She is also an active member in her church, getting to know her neighbors and giving back to the community.
Dr. Sarah Prehn

Michael Sanzari, DMD

Michael Sanzari, DMD graduated from the University of Dentistry and Medicine of New Jersey and completed a general practice residency program at St. Joseph’s Hospital, followed by orthodontics training at Columbia University. Dr. Sanzari has over 20 year of experience and is known as a perfectionist who takes a personal interest in every patient with a meticulous attention to detail. He specializes in Invisalign, traditional braces and removable orthodontic appliances. He is active in several industry organizations and enjoys straightening teeth and witnessing how it can change people’s lives and improve self-esteem.

When Dr. Sanzari was younger, he went through orthodontic treatment. He was so happy with the results that in high school he decided that he wanted to be an orthodontist. He wanted to be able to help other people as his orthodontist helped him. When asked what he finds to be the most rewarding aspect of his job, he replies, “I love seeing the transition in patients from being shy with low self-esteem to becoming outgoing, confident, happy patients. I also enjoy seeing multiple family members in treatment, including parents. You get to see families grow. It’s like we are all one big family.”
Dr. Michael Sanzari

Helmy Mostafa, DDS

Dr. Mostafa was born in Milwaukee, WI, where he completed his Advanced Education in General Dentistry (AEGD) residency at Marquette University. He then went to Boston university for his Doctorate, Doctor of Science in Dentistry. Afterwards, he went to Jacksonville University school of Orthodontics in FL where he completed his orthodontic residency.

Dr. Mostafa is a member of the American Association of Orthodontists, the American Dental Association among many others. Most notably he was bestowed the distinct honor of fellowship in the prestigious American College of Dentists and the Pierre Fauchard Academy. Both organizations select members of the highest ethical, moral and professional standards, and based on their exceptional contribution to organized dentistry, oral health care, dental research and education. To sum it up, Dr. Mostafa will go the extra miles for his patients smiles.

Dr. Mostafa enjoys hiking and watching waterfalls, snorkeling, skiing, skating, hunting, traveling and exploring new places, food and restaurants with his wife and 3 boys.
Helmy Mostafa Orthodontist

Keith Nicholson, DDS

Dr. Keith grew up in Central NY but embarked on a journey south to North Carolina after graduating high school. His snow-shoveling muscles needed a rest! He attended Davidson College and played soccer for the Wildcats. Following college, he went to dental school at the University of North Carolina. Dr. Keith subsequently completed his orthodontic residency at the University of Louisville, obtaining a Certificate in Orthodontics and an MS in Oral Biology for his research on Invisalign.

Dr. Keith loves orthodontics because it’s a synthesis of math and science. Most importantly, it enables him to work with patients to smile more confidently. Dr. Keith has spent the last 11+ years in private practice, where he has enjoyed the opportunity to work as a team with patients and co-workers. Additionally, he was a part-time faculty member at the University of Louisville orthodontic program. It was invigorating to be part of the academic environment where he could teach residents and stay abreast of emerging techniques and technology. Dr. Keith sincerely believes that “The shortest distance between two people is a smile” and that a smile is a great opening line – or curve – for most conversations.

After nine wonderful years in the Louisville region, Dr. Keith and his family have decided to move closer to family on the east coast. He is a lifetime learner and obtaining his MBA from Wharton at the University of Pennsylvania.

Dr. Keith and his wife have two children and a snarky cat. Outside the office, his favorite activity is spending time with family and friends. Otherwise, he enjoys soccer, tennis, martial arts, traveling, and cheering on his favorite sports teams.

Kanchi Shah, BDS DDS ABO-Ortho

Kanchi Shah, BDS DDS ABO-Ortho, grew up in India and studied biology as an undergrad. As a child, she always knew she wanted to be in the medical profession associated with making patients happy. "What better than giving them smiles." This led Dr. Shah to the University of Michigan School of Dentistry, where she graduated in 2018. After practicing general dentistry for a decade, Dr. Shah became an Orthodontist, giving her "an eye to create a balanced occlusion, plan smiles to minimize prosthetic dental work, and increase longevity of your dental work and your beautiful smile.

Dr. Shah attended a three-year residency program at Bronx Care Hospital in NY, where she received her Certificate in Orthodontics. Dr. Shah is an expert in aligners and adult orthodontics, as well as braces for children. Those are her favorite dental procedures to perform. She has enjoyed giving kids a smile every other year through her volunteer work with Mission of Mercy and has undergone international volunteer missions in Kenya with the Global Initiatives Outreach Program from the University of Michigan. Dr. Shah is also a part of several dental organizations, including ADA, PDA, AAO, and WIO. "Average is just above low and right below good; let's strive to be the best at what we do," is Dr. Shah's favorite saying. Undoubtedly, she lives up to her life's motto with her passion for serving through superior dentistry.

Outside of serving the community, Dr. Shah has a lovely family she enjoys spending time with, including her spouse and two children. She appreciates watching her beautiful daughter and adorable son grow, smile, and embrace life.
Dr. Kanchi Shah, BDS DDS ABO-Ortho
Rich Orthodontics
Philadelphia, PA
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