Meet our Ellicott City Dentists and team!

Dr. Todd Singer

Todd Singer graduated at the top of his class from SUNY Stony Brook Dental School in 1997. He then attended the prestigious Periodontics and Implant Residency Specialty Program at the University of Maryland School of Dentisty and again graduated at the top of his class in 2000.
For more than 20 years Dr. Singer has dedicated his professional career to his patients and his students. While in private practice Dr. Singer specializes in advanced Dental Implant and Periodontal surgery and in the complex ProstheticTooth Rehabilitation to insure optimal oral health, chewing, and smiling for a lifetime!
Dr. Singers’ passion for teaching and education has remained throughout his entire career. He has lectured extensively to thousands of dentists, specialists, hygienists, dental support staff, and business executives. He has had appointments on the faculty of the NYU School of Dentistry, the University of Maryland School of Dentistry, and at the University of Pennsylvania School of Dentistry. He most recently served as an Assistant Dean at the University of Pennsylvania School of Dentistry.
When Dr. Singer is not practicing and teaching he can be found spending time with his wife and children who all share a love of the outdoors, local sports, and rescuing dogs.

Dr. Ryan Whitescarver

Dr. Whitescarver grew up in Montgomery County, MD, and attended the University of Maryland, College Park as a Life Sciences Scholar studying Neurobiology & Physiology. He then graduated at the top of his class at the University of Maryland School of Dentistry. While in dental school, Dr. Whitescarver earned membership in multiple honor societies including the Oral Surgery Clerkship in which he received more experience performing surgical procedures. Dr. Whitescarver then furthered his dental experience and education attending a 1-year general practice residency at Wellspan York Hospital in York, PA. Dr. Whitescarver is confident  performing a wide range of dental procedures with aims to provide the highest standard of dental care to every patient he treats.

Dr. Whitescarver knew he wanted to be a dentist since high school. He fell in love with the idea of dentistry melding healthcare and art, improving patients’ confidence through their smile, and ultimately improving lives all through working with teeth!  Dr. Whitescarver believes in involving and educating his patients regarding their dental care so that they are just as invested in their oral health as he is.

When not in the office, Dr. Whitescarver enjoys playing soccer, spending time with family and friends, and getting lost in a good book/videogame every once in a while.

Dr. Cory Callahan

Dr. Callahan was born and raised in the Baltimore area. He received his bachelor’s degree in biology at UMBC while simultaneously playing 4 years of Division 1 baseball as a pitcher for the Retrievers. He went on to attend the University of Maryland School of Dentistry and earned his degree in 2021. In pursuit of further dental education with a focus on prosthodontic and implant dentistry, Dr. Callahan was accepted into a competitive 1-year AEGD residency program at the University of Texas School of Dentistry at Houston. After completely his residency in July 2022, he joined the practice and could not be more thrilled to provide care to his hometown community.

Currently, Dr. Callahan is part-time here at Dorsey Family Dental while simultaneously completing a full-time periodontics residency at the University of Maryland School of Dentistry, where he is undergoing advanced training in soft tissue grafting, bone grafting, sinus augmentation, and dental implant therapy.

Dr. Callahan strives to provide the best care possible while incorporating new and innovative technologies. He is currently a member and participant in several organizations, including the American Dental Association, Academy of General Dentistry, American Academy of Implant Dentistry, and American Academy of Periodontology.

Dr. Callahan currently resides in Howard County, MD. Outside of the office, Dr. Callahan and his wife enjoy spending time with their families and friends. They can usually be found at Camden Yards and M&T Bank Stadium cheering on the Orioles and Ravens!

Dr. Denise Hidan

Dr. Denise Hidan, the daughter of two immigrants, was raised with a strong work ethic and a sense of compassion for other people. She earned her Doctor of Dental Surgery from the University of Maryland School of Dentistry, where she co-authored research on dental restorative materials and earned the Dean’s Research Award.

Dr. Hidan enjoys aesthetic restorative dentistry and delivering patient-centric treatment rooted in evidence-based dentistry.

When Dr. Hidan is not helping patients achieve beautiful smiles, she enjoys fencing, cooking, and photography.

Dr. Desire Renggli

Dr.Desire Renggli was born in Ethiopia and her family’s journey brought her to Maryland in 2005. She attended the University of Maryland, College Park and earned a Bachelor of Science in Neurobiology & Physiology. She earned her Doctor of Dental Surgery from the University of Maryland School of Dentistry. Following dental school, she completed a 1-year General Practice Residency at the NYU Langone Hospital in Long Island.

Dr.Renggli understands that dentistry is beyond fixing teeth; it is about treating people. She is interested in preventative dentistry, prioritizes patient education, and enjoys performing a variety of dental treatments including cosmetic dentistry.

When Dr.Renggli is not practicing dentistry, she enjoys being outside, cooking/eating all types of cuisines, and staying active!

Meet Our Friendly and Competent Staff


Janet, our office manager, works at keeping the Ellicott City office running smoothly and is always available to help with any concerns our patients may have.


Our patient accounts manager is very knowlegable in handling Insurance and working with patients financial needs.


Our highly qualified and progressive hygienists are truly committed to educating our patients about oral hygiene. Our hygienists also frequently attend continuing education courses.


Upon entering our office, our patients are greeted by our caring and friendly front desk staff. They are always willing to answer any questions regarding scheduling appointments, insurance, billing, etc., and always with a smile.

We are very proud of our staff. We are sure you will enjoy getting to know everyone here!