Dental Excellence


About Us

Office Administrators


Emily began working in dentistry in 2004 when she was trained as an assistant in a cosmetic dental office. She switched to the front office after moving from Illinois to Arizona in 2009, where she also began her studies towards her degree in Health­care Business Management. When not in the office, she enjoys spending time with her family and at church. Her passions are painting, reading, writing, history and computer science. Devotedly a student for life, she jokes that if she could, she would learn it all.



Aris is a compassionate and caring former Finance Director/Banker and one of the friendly faces at the front desk. She is dedicated to finding ways to help people smile and that includes building confidence to share their smile! She is happy to answer your questions, plan for appointments, help resolve concerns, and make your visits positive. It is import­ant to her that each of you enjoy a feeling of ease and confidence in our office. Her positive energy is felt by everyone, and she truly appreciates the tentative care our doctors and team strive to provide, as individuals and collectively, to each patient. When she is not glued to a computer screen or assisting patients, she spends time working in her garden, cooking, enjoying the outdoors, and spending as much time as possible with her adorable Granddaughters. Read More

Dental Hygienists


Hello, my name is Jo. I am a native of Plymouth, Michigan and moved to Tucson in 1975. I have been with Dr. Hornsby as a Registered Dental Hygien­ist since 1996. In January of 2018, we joined offices with Dr. Biede and Dr. Bell. I am so proud to work with such a dedicated group of caring dental pro­fessionals. My experience in both a periodontal practice and in this general dentistry practice his given me the opportunity to succeed in arresting periodontal disease and motivating my patients to keep their mouths as healthy as possible. I apply an individualized patient approach to maintaining and coaching patients on how to achieve excellent periodontal health. My favorite things to do when I’m not working are traveling to see family and friends with my husband, hiking, and paddle boarding. Read More


My name is Donna Howard. I grew up in Oracle, AZ. I have this passion to help and educate people. I received three degrees in search of figuring out what I wanted to do for a living. I found Dental Hygiene to be the best way for me to take care of people for the past 17 years. When I’m not working, I enjoy hiking our Arizona trails with my son, spending time in our cabin in the White Mountains with my dog and best man, and reading books.


My name is Kaya. I am a native Arizonan and grew up right here in Northwest Tucson. I graduated from the University of Arizona with a Bachelor’s degree in merchandising. I decided to go back to school for dental hygiene and graduated from Pima Community College as a Registered Dental Hygienist in 1997. I began working with Dr. Dan Hornsby in January of 1998. While the majority of my experience has been in general and cosmetic dentistry, I have also worked in a periodontal practice specializing in the treatment of gum disease and implant care. I truly enjoy my coworkers and my patients, and am proud to help them achieve optimal oral health and a great smile. I have been married to my husband, Matthew, for over 20 years. He is an officer with the Tucson Police Department canine unit. We have two amazing boys, Nathan and Kellan, who are my absolute pride and joy. I love traveling, especially to explore our National parks. I enjoy camping, hiking, photography, Bible study and spending time with my family. Read More


Hi I’m Lisa! I have been doing Dental Hygiene since 1999 and absolutely love what I do. I have 3 children that keep me busy with sports and activities. I have been married to my hus­band Rene since 1998. My hobbies are swimming, biking, running and Orange Theory. I have a Corgi named Rugby and a Westie named Jasper.

Dental Assistants


I have been in the beautiful Tucson community for over 33 years. I obtained my dental assistant certification from Pima Medical Institute along with an Associate’s Degree from Pima Community College. I have been a dental assistant for over 20 years. I absolutely enjoy my profession. When I am not working, I spend my free time in the gym working out. I have one daughter who keeps me busy with softball and marching band. I enjoy spending time with my family and friends.


Letty heartily believes your smile is priceless. She has been assisting for Dr. Hornsby for over 27 years. Time flies when you are passionate about your profession and truly desire the best outcomes for all of your patients. A Tucson native, she’s a Sunnyside and Pima Medical Institute graduate. Impressed by “The Innovation and Technologies we are leveraging these days.” Adding, “We have come so far in providing beautiful and bonded fillings,enduring smiles for all.” Away from the office, Letty enjoys time with her husband Ed, and Schnauzer/Yorkie “Bailey” here in the Oro Valley parks. She is also a big fan of collegiate level sports. Read More


I was born in Flagstaff, Arizona. Years later I moved with my family to Tucson. During high school, I attended a JTED program for dental assisting. After two years of training, I became a Certified Dental Assistant. I love being able to come to work and learn something new every day. I enjoy the opportunity to meet new people and help them have a successful dental visit. When I am not at work, I spend time with my daughter by playing outside and having dance parties.