Meet The Doctors


Keith A. Van Tassell, D.D.S.

Pediatric dentist Dr. Keith Van Tassell

Dr. Keith (as his patients know him) loves working with kids. He was born in California and grew up in some small towns in Utah and Idaho. He graduated from Weber State University in 2000 and entered dental school that same year at Virginia Commonwealth University School of Dentistry in Richmond, Virginia. Dr. Keith graduated Magna Cum Laude in 2004 and was elected into the OKU dental honor society which is reserved for the top 10% of graduating dentists in the nation. He was also awarded the Pierre Fauchard Academy Certificate of Merit for outstanding academic achievements. After dental school, Dr. Keith attended the University of Nevada School of Medicine for a two year pediatric dental residency where he served as chief resident his final year.

Dr Keith is a Board Certified Pediatric Dentist. He dedicates himself to providing the best dental care possible for his patients, insuring that they have a positive and fun experience while learning to care for their own oral health.

Dr. Keith enjoys spending time with his family, being outdoors, running, and playing just about any sport. He and his wife have five children (four daughters and a son). They moved to Ft. Collins in August 2006 to begin his practice. They love the community and are proud to call Ft. Collins home.

Memberships and Professional Associations:

  • Diplomate American Board of Pediatric Dentistry
  • American Academy of Pediatric Dentistry
  • Colorado Dental Association
  • Larimer County Dental Society
  • Harmony Surgery Center

Zachary Alleman, D.D.S.

Pediatric dentist Dr. Zach Alleman

Dr. Zach grew up in The Colony, Texas, a suburb north of Dallas. He earned his bachelor’s in Exercise Science from Brigham Young University and pursued his dental training at Baylor College of Dentistry.

After receiving his Doctorate of Dental Surgery, he decided to complete his residency at Baylor where he could take advantage of its strong Pediatric Dentistry program, which is affiliated with Children’s Health Dallas and Texas Scottish Rite Hospitals. Interacting with these incredible hospitals gave him extensive training with managing patients with special healthcare needs.

Pediatric dentistry is a perfect fit for Dr. Zach, who has always been surrounded by children. He is the fifth of eight children, father of two, and uncle to 25 nieces and nephews. He loves providing quality and fun treatment to ensure each child gets off to a terrific start with their oral health.

When Dr. Zach isn’t in the office, he likes to spend time outdoors with his family. He also enjoys cycling and playing basketball, tennis, and volleyball. He’s also an avid reader.

Dr. Zach and his family are excited to call Fort Collins home.


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