Our Pediatricians

At Lone Tree Pediatrics, we are dedicated to helping you and your child feel at home from the moment you walk through the door. We pride ourselves in being an exceptional pediatric practice where your children come first. Our pediatricians and medical staff are highly trained professionals and maintain the highest level of accreditation in pediatrics to address the special needs of infants, children, and teens.
dr debra berry md pediatrician Debra M. Berry, M.D.

Dr. Debra Berry is a warm, compassionate board-certified pediatrician treating patients in Lone Tree, Colorado, and the surrounding communities. Her primary goal as a physician is to help each of her patients live a healthy life and grow into a happy productive adult. She treasures being a part of every stage of a child’s life — from the early days of a newborn’s life through childhood and into the formative teenage years.


Dr. Berry graduated Phi Beta Kappa from the University of North Carolina at Chapel Hill. She attended the University of Tennessee College of Medicine on a full academic scholarship as part of the Gooch Scholar program. At UT, she also received the Dorothy Snider Award and was named the Outstanding Medical Student in Pediatrics. Dr. Berry completed her internship program and residency training at the University of Colorado here in Denver. She holds certification from the American Board of Pediatrics, was named to the Alpha Omega Alpha Medical Honor Society and is a member of the American Academy of Pediatrics.


Dr. Berry has been named Best of the Best of Pediatricians in Lone Tree and currently serves as the chair of pediatrics at Sky Ridge Medical Center. When she is not treating patients, Dr. Berry enjoys trail running, mountain biking, hiking, reading, and spending time with her husband, son, and daughter.

dr emily vangeti md pediatrician Emily Vangeti, M.D.

Dr. Emily Vangeti grew up in the Monument area and graduated from Lewis Palmer High School. As a physician, she strives to connect with each of her patients and their families. She cherishes playing a role in lives of children of all ages. Dr. Vangeti is a board-certified pediatrician.


Dr. Vangeti graduated from the University of California – Santa Barbara and was also a member of Phi Beta Kappa. She received her Bachelor of Science in Biological Science and then went on to earn a Master’s of Science in Physiology at Georgetown University. She attended medical school at Jefferson Medical College in Philadelphia. While there, she received the Edward J. Moore Award for Aptitude in Pediatrics. She completed her residency in Delaware at A.I. DuPont Hospital for Children. She holds a certification from the American Board of Pediatrics.


Dr. Vangeti met her husband in medical school, and they were overjoyed to welcome their daughters, Neela, in 2014 and Ella, in 2017.  As a newer mom, Dr. Vangeti understands the concerns and worries that come with being a parent. When Dr. Vangeti is not practicing pediatrics, she enjoys spending time with her family, along with reading, traveling, exercising and cooking.

dr david roos md pediatrician David Roos, M.D.

Dr. David Roos is a board-certified pediatrician, and has been a practicing pediatrician since 1982. With over thirty years of experience, Dr. Roos provides the best caliber of care to his patients. He places a great deal of emphasis on the physical and emotional well-being of each of his patients.


Dr. Roos received his degree from the University of Colorado Medical School. He completed his Internship and Residency in the Denver area as well. His particular pediatric interests include: diabetes, care of the premature infant, and the treatment of behavioral and emotional issues, including ADD/ADHD. Dr. Roos was the Chief of the Pediatrics Department at the Medical Center of Aurora South. In addition, he served on the board of Colorado Pregnancy Centers in Aurora, CO as the Vice President, and was a board member of the Inner City Health Center in Denver, CO. He holds a certification with the American Board of Pediatrics. His other memberships include: American College of Pediatricians, Colorado Medical Society, American Association of Pro-Life Pediatricians, and served as President of the Colorado Chapter of the Christian Medical/Dental Society.


When Dr. Roos isn’t at the practice, you’ll find him with his wife, Janie, and their four children and six grandchildren. In addition to quality family time, Dr. Roos plays guitar, gardens, skis, and enjoys traveling.

dr lisa haynes md pediatrician Lisa Haynes, M.D.

Dr. Haynes is a board-certified pediatrician who comes to us with 18 years of experience in pediatrics. She graduated from the University of Arkansas College of Medicine at Little Rock, where she also completed her residency in 2002. She then went on staff at the Arkansas Children’s hospital where she continued to develop her passion for pediatric medicine. Dr. Haynes specializes in adolescent medicine and has three years of experience working in a pediatric ER. In addition to this, she also has significant experience with neurology as she spent a year in a neurology clinic. Lisa has been in private practice since 2012 and is affiliated with Children’s Hospital Colorado, Littleton Adventist Hospital, Skyridge Medical Center and Swedish Medical Center.

When not in the office she enjoys teaching about pediatrics and spending time with her three children.

rachel vaivoda np pediatrics Rachel Vaivoda, NP

We are sad to inform you that Rachel Vaivoda will be leaving Lone Tree Pediatrics as of 10/07/2021. This was a difficult decision for Rachel as she has loved practicing at Lone Tree Pediatrics, but new adventures and unique opportunities take her to Seattle, Washington.

Our team of providers here at Lone Tree Pediatrics are honored to continue to serve your family with all your pediatric primary care needs.  If you have any questions about your current or future treatment needs don’t hesitate to call us at 303-803-1005.

We apologize for any inconvenience this change may cause. We are committed to providing the highest quality of care and will do our best to make this a smooth transition with no interruption to your care. We know you will join us in wishing Rachel Vaivoda all the best during this transition!

Nancy Taoka, M.D. Nancy Taoka, M.D.

Dr. Nancy Taoka has been a pediatrician in the Littleton area for almost 20 years and has just joined Lone Tree Pediatrics. She grew up I Kansas and attended the University of Kansas Medical School (and is a huge Jayhawk basketball fan!). She came out to Denver for Pediatrics Residency at the University of Colorado and now can’t imagine living anyplace but Colorado. She enjoys traveling, however, and expresses her artistic side through scrapbooks of her travels. Her scrapbooks also show her skiing, serving the community with her Rotary Club, or cheering at a Rockies baseball game.


Matthew Hadeed, DO Matthew Hadeed, D.O.

Matthew Hadeed, D.O. is board certified in Pediatrics.
He earned his medical degree from Western University of Health Sciences. He completed residency at UCSF Fresno where he won the award for Highest Individual Patient Continuity.

Dr. Hadeed’s professional interests include newborn and neonatal medicine. Additionally, he is also interested in improving emergency response and preparedness in outpatient pediatric settings with limited resources. He also focuses on global health and working with Spanish-speaking populations.

He has volunteered his time for many organizations including UCSF Fresno’s Mini Med School, providing sports physicals at Clovis Unified School District, and the Special Olympics North California as a coach and medical volunteer.

Dr. Hadeed’s hobbies include snowboarding, wakeboarding, rock climbing, trail running, cooking, fishing, camping, and photograph. He is fluent in Spanish.

Hannah Salter, PNP Hannah Salter, NP

Hannah Salter is a friendly and compassionate board-certified Pediatric Nurse Practitioner originally from Seattle, WA. Hannah completed her Bachelor of Science degree in Neuroscience at The University of Southern California. After graduating college, Hannah obtained a BSN in Nursing at Johns Hopkins University, in Baltimore, MD. Hannah worked for several years in the Neonatal Intensive Care Unit at Children’s National Medical Center in Washington, DC as a bedside nurse. Meanwhile, she obtained her Pediatric Nurse Practitioner degree at Johns Hopkins University where she graduated with honors. Before relocating to the Denver area, Hannah worked as a Pediatric Nurse Practitioner for several years at Pediatric Associates of Alexandria, a large private practice in Alexandria, VA. Hannah is a member of the National Association of Pediatric Nurse Practitioners.


Hannah has clinical interests in care of the premature infant, asthma management, and breastfeeding support. When Hannah’s not in clinic, you’ll find her hiking with her dog, cooking, reading, and exploring national parks.

Lindsey Haight, CPNP-PC Lindsey Haight, CPNP-PC

Lindsey grew up wanting to work in pediatric medicine and attributes that to having a great pediatrician herself. “I love kids and I’m extremely passionate about educating and empowering my patients and their families to live their healthiest and happiest lives!”

Lindsey Haight is experienced in pediatric primary care working with patients of all ages. She is a member of the National Association of Pediatric Nurse Practitioners & The Colorado Society of Advanced Practice Nurses

“I am particularly passionate about newborn medicine and breastfeeding support. I have additional interests in asthma management as well as childhood obesity. There is a meaningful benefit for almost everyone to get some sort of physical activity! That can mean taking a 30-minute walk outside with their family or can include playing in the backyard with friends or siblings. The benefits are endless not only for our physical health but for our mental health as well!”

Lindsey is a Colorado native and loves being able to practice medicine and provide care to patients in the same area that she grew up. When not working, you can usually find Lindsey spending time with her husband, daughter and Bernese Mountain Dog, Baloo! “I love being outside – hiking, running, paddle boarding, camping, etc. When I’m not outside, I’m most likely in the kitchen baking something sweet for my family!”