Keen Family Dentistry
Dental Office of C. Mark Keen & Bryce M. Keen DDS
General and Cosmetic Dentistry
Call: (909) 989-6661

Meet Our Team



Mrs. Diana Keen

Front Office

 Hello, my name is Diana Keen, wife of twenty-eight years to Dr. C. Mark Keen. We have two boys together, Dr. Bryce M. Keen and soon to be Dr. Blake C. Keen who is still at USC Dental School. I grew up in Hacienda Heights, CA and have two sisters and a brother. Because our last names began with "K", Dr. Keen and I were in the same homeroom together in High School. I didn't get to know him until we both worked for Sears. I was a hardware manager at Sears for 18 years, and Dr. Keen's father was my boss. Dr. Keen was given a summer job at Sears before he started Dental School. This is when we were reunited. It is amazing how things work out. I enjoy outdoor activities such as camping, hiking, boating and my favorite, motorcycle riding! I began working for Dr. Keen when he first started his office in 1995, but only until he was able to hire a Receptionist, and now I am back in the office during these difficult COVID times. It is great working and helping all of the wonderful patients we have at the office. The best part of my new work day is coming home to my two excited Dobermans, Prince and Roxy, that miss me and don't know why I have left them all day.




Office Manager

Hi! My name is Monique and I am the Office Manager at Keen Family Dentistry. I have worked with Dr. Keen since May 2016; however, I have been in the Oral Surgery and Dental field since 2015. Dentistry is truly my passion. I absolutely love our patients and the relationships we establish with them. My goal is to provide you with the best care, answer all of your dental questions and assist you in the best treatment to having a gorgeous smile. When I’m not at the office I enjoy spending my days with my boyfriend and our pups, Mötley and Cooper, going on different adventures! Working with Dr. Keen and the rest of our staff is the best experience and we truly are one big family that I am so grateful to be a part of! 


Communications Coordinator

Hi there! My name is Vanessa. I am the newest member of Keen Family Dentistry as the Communications Coordinator. I was born and raised here in the Inland Empire, then lived in West Texas for 3 years but recently moved back to California, my permanent home. When I'm not at work, I am at home being a Dog-Mom to my German Shepherd, Zeppelin and my Belgian Malinios, Maiden. I also have a passion for cooking and baking with my dad! I can't wait to meet and greet you all!


Registered Dental Assistant

Hello, my name is Luis, also known as Dr. Keen’s right hand man. I graduated from Dental school from Mexico City in1984.  I have been working alongside Dr. Keen since 1995. On my days off I enjoy spending time with my grandchildren and barbequing with friends and family.  


Dental Assistant

Hello! My name is Melody. I graduated from UEI College of Encino. I recently started here at Keen Family Dentistry as a Dental Assistant and I look forward to working with all the amazing staff here.


Registered Dental Hygienist

Hello, my name is Jazzmin! I have grown up in the Upland area since the age of 10. Back in 2015, I received my Bachelors of Science in Dental Hygiene from West Coast University. I always strive to ensure all of my patients feel 100% comfortable in our office. Away from the office, I love spending time with my husband and beautiful children, Aria and Ashton. One of my favorite things to do on a Friday night is to play board games with my family!


Registered Dental Hygienist

Hi! I am Donna, Registered Dental Hygienist as of September 2019. I have always loved dentistry and bringing healthy smiles to our patients is my goal. I have worked in the dental field since 2009 and love being a part of the Keen Family. In my spare time, I enjoy walks with my husband, two kids and my dog, Cosmo. We also love traveling the world and exploring new foods.


View More