Our Offices: Prescott (928) 641-4000
Prescott Valley (928) 772-9860|Chino Valley (928) 636-1565

Dr. Mark Costes
Dr. Sean Reed



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Doctors & Staff

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Dr. Mark Costes

Horizon Dental

Dr. Mark Costes received a Bachelor of Arts from the University of California, San Diego and a Doctor of Dental Surgery from the Marquette University School of Dentistry.

In 2001 Dr. Costes was married to his beautiful wife Leslie in San Diego, the city where they met and fell in love. They have three sons, Bryce, Brendan and Brady.

Dr. Costes enjoys working with patients of all ages. He is certified to perform oral conscious sedation which can create a stress free dental experience for even the most fearful dental patient.

Dr. Costes is very active within his community and serves as the President of the Chino Valley Chamber of Commerce. He also serves as clinical faculty for the Arizona School of Dentistry and Oral Health. In addition, Dr. Costes provides a minimum of eight hours of charitable dentistry each month to the homeless population of Arizona.


Dr. Sean Reed

Horizon Dental

Dr. Sean Reed grew up in Chicago, IL and Denver, CO. Following high school he attended Brigham Young University where he graduated with a Bachelor of Science degree in Psychology and a minor in Spanish.

Dr. Sean Reed obtained his Doctor of Dental Surgery degree at New York University & later completed a 1-year residency in general dentistry at the University of Utah.

He, his wife, & their three children are thrilled to live & work in the beautiful Prescott, AZ area.


Dr. Wayne Woellhaf

Horizon Dental

Dr. Wayne Woellhaf attended UC Denver where he received a BS in Biology. He received his DMD degree from Midwestern University in Glendale, AZ.

He has been married to his wonderful and beautiful wife Ashley for over 20 years and has two energetic teenage boys. His oldest son Mitchell is currently serving a church mission in Virginia. His younger son just completed his sophomore year of high school. As a family, their favorite vacation spot is Disney!

Wayne served an LDS mission in Taiwan and learned Mandarin Chinese. He enjoys running and exploring the many hiking trails in AZ. His favorite thing to do in his free time is scuba diving.

Dr. Woellhaf believes in preventive care and education. He prides himself on being honest and forthcoming about a patient’s dental needs.





Horizon Dental

Kristie
Hygienist,
Chino Valley
I graduated with my degree in Dental Hygiene from Loyola school of Dentistry, Chicago. I have been practicing for over 28 years. I have 4 grown children and 2 grandchildren. I have lived in the tri-city area for over 20 years and enjoy the many outdoor activities that Arizona has to offer. I now live in Chino Valley and love the small town atmosphere and the friendly people in the community.




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Darla
Office Supervisor,
Chino Valley
I was born and raised in Arizona. I have lived in the area for 19 years and been in the dental field for 30 years. I have 2 grown children and 2 grand daughters. I love to scuba dive.




Horizon Dental

Amanda
Office Supervisor,
Prescott Valley
I grew up in Ash Fork and now live in Prescott Valley with my husband and beautiful daughter Alley. We enjoy spending time with our older children and grandchildren. I have work for Horizon Dental Group since 2006 and have enjoyed all the experiences I have had.




Horizon Dental

Kelcie
Billing,
Prescott Valley & Chino Valley
I have worked with Horizon Dental Group for over 4 years. I live in Mayer Arizona with my 2 beautiful children and wonderful husband. I have been in the dental field for close to 10 years now and find it very enjoyable.




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Ashlee
Marketing Assistant - Executive Assistant,
Prescott Valley & Chino Valley
I moved to the Prescott area in the summer of 2012 from Charlotte, NC. I love spending time outdoors: hiking, camping, and fishing.




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Lori
Hygiene Coordinator,
Chino Valley
After spending 45 years in Colorado my husband and I moved to Prescott in 2012. I've been in dentistry 30 for years and joined Horizon Dental Group in mid November 2012. I enjoy anything that has to do with the outdoors.




Horizon Dental

Devin
Back Office Assistant,
Chino Valley
I am 19 years old and I have been a dental assistant for 6 months now and I love it. I spend most of my time with my 2 puppies and my boyfriend. I am constantly out of town at car events which is my only hobby.




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Claudia
Billing,
Prescott Valley & Chino Valley
I'm 20 years old. I am from Chino Valley, AZ. Working out is my hobby. I love to spend my free time with my husband, friends, and family.




Horizon Dental

Michelle
Treatment Coordinator,
Prescott Valley
I've lived in Prescott for most of my life. My husband and I have been married for 9 years and have a 1 year old daughter, Emery. We enjoy spending time with our family and friends, watching Netflix and chasing Emery around as she explores!




Horizon Dental

Brook
Hygiene Coordinator,
Prescott Valley
I was born and raised in Utah and have lived in Arizona for the last 7 years. I've been married for just over a year, and my husband and I have 3 children, Riannan, Houston and Amanda. I enjoy music, books and movies. Our family enjoys the outdoors and spending time together!




Horizon Dental

Ryan
Hygiene Assistant,
Prescott Valley
I have lived in Prescott Valley for most of my life. I am a newlywed and enjoy spending time with my beautiful wife. We love spending our time together exploring the beauty Prescott has to offer. I am currently attending Hygiene school at NAU .




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Courtney
Registered Dental Hygienist,
Prescott Valley
I was born and raised in Arizona. I have been a hygienist for 2 years. I have worked with Horizon Dental for 8 years and I enjoy working in the Dental field very much.




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Megan
Dental Assistant,
Prescott Valley
I was born in Oak Harbor, WA and moved to AZ when I was 3 years old. I have 1 daughter who is 2 years old. I am currently enrolled at Yavapai College getting my associates degree to attend Hygiene school.




Sara
Front Office,
Prescott Valley
I have lived in Arizona for the last 3 years. My husband and I have 2 children, Amelia (age 3) and Wyatt (6 months). I have worked in the dental field for 2 years and love it. On my days off I enjoy spin class, spending time with my family and reading.