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

Meet Our Team


















Mrs. Diana Keen

Front Office


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

Hello, my name is Katie. I recently graduated with my Dental Assisting Certificate in September 2019 from Chaffey College. I am currently working on receiving my Associates in Health Science by May 2020. During my time outside of the office I enjoy being with my 8 year old son and my boyfriend at Disneyland or doing something adventurous. I am excited to be apart of Keen Family Dentistry and to meet all of our patients! 


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.  


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 baby girl, Aria. One of my favorite things to do on a Friday night is to play board games with my family!


Registered Dental Hygienist

Bio Coming Soon!


Registered Dental Hygienist

Bio coming soon!


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