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About Us

About Us

Welcome to Our Practice!

Thank you for choosing us to be your child’s doctor and welcome to our office. Dr. Ellis and her team of 8 pediatric providers have been practicing in the Austin area for over 20 years. It’s a small private practice with offices in North Austin, Cedar Park, and Leander. 

While offering a caring, personalized approach, we’re committed to the highest quality of care and to making the office a welcoming environment for everyone. If you feel we have any shortcomings, or have any suggestions for improvements, please do not hesitate to drop a note, or speak with us directly. Languages spoken by staff are Portuguese and Spanish.

Leighton Ellis, MD

Dr. Ellis was born in New York City but raised in São Paulo, Brazil until the age of fourteen when her family moved to the States to further her schooling. She attended Florida Atlantic University in Boca Raton, FL and went on to complete medical school at the University of South Florida College of Medicine in Tampa. Today, Dr. Ellis has been practicing medicine in Austin for over 20 years and is the Chair of Pediatrics at St. David’s North Center Hospital. Additionally, she is the past president of the Central Texas Pediatric Physicians Alliance and has been continuously nominated one of the best doctors in Austin. She and her husband, Ken, have two sons, Kenny and Michael; they enjoy traveling, snorkeling, and cooking as a family. Dr. Ellis is certified by the American Board of Pediatrics and is a Fellow of the American Academy of Pediatrics, and she is fluent in Portuguese and Spanish.

Erica Sharp, MD

Erica Sharp was born in Kingston, Jamaica and spent her early years living between the United States, England, and her native country. She received her Bachelor of Science degree in Psychology from Tulane University in New Orleans, Louisiana in 1992. After traveling in Central America, she returned to New Orleans to attend the Tulane School of Medicine from which she graduated in 1997. She subsequently completed her pediatric residency training at the University of Maryland in Baltimore before heading to Austin, Texas. Dr. Sharp has been practicing here since 2000, and joined North Austin Pediatrics, P.A. in the summer of 2004. Dr. Sharp is married to her husband, Ryan. The two have their daughter, Sarah. Dr. Sharp enjoys children of all ages, and has a special interest in adolescent care. Dr. Sharp is certified by the American Board of Pediatrics and is a Fellow of the American Academy of Pediatrics. She sees patients in our Austin office.

Rebekah Sperling, MD

Rebekah Sperling was born in Baltimore, Maryland and moved to Hewitt, Texas with her family at 12-years old. She attended the University of Dallas where she received her Bachelor of Art degree in Biology in 2000. During her junior-year summer, Dr. Sperling explored Costa Rica while studying Spanish. After graduation, she attended medical school at the University of Texas Health Science Center at San Antonio. While in school, she took six weeks to go on a medical mission in Uganda. She worked with and treated the Bwindi pygmy people, educating and treating her patients for malnutrition, tropical diseases, and H.I.V. The African continent is still dear to her. Upon her graduation in 2004, Dr. Sperling moved to Providence, Rhode Island to complete her pediatric residency at Hasbro Children’s Hospital an affiliate of Brown University. She is happy to have returned to Texas, and she’s been with North Austin Pediatrics since 2007. Dr. Sperling is married to her husband, Chris. The two have a daughter named Elizabeth Rose, and two golden retrievers. Dr. Sperling is certified by the American Board of Pediatrics and is a Fellow of the American Academy of Pediatrics. She sees patients in our Cedar Park office.

Christine Lam, DO

Christine Lam was born and raised in Houston, Texas and attended the University of Texas at Austin where she received her Bachelor of Arts degree in English and Biology in 2003. She graduated from the University of North Texas Health Science Center – Texas College of Osteopathic Medicine in Fort Worth in 2007 and completed her pediatric residency training at the University of Texas Medical Branch in Galveston in 2010. Later that year, she joined North Austin Pediatrics. In her free time, Dr. Lam enjoys traveling, cooking, and spending time with her husband, Jonathan (an Aggie of all things) and their two Welsh corgis, Rito and Roscoe. Dr. Lam is certified by the American Board of Pediatrics and is a Fellow of the American Academy of Pediatrics. She sees patients in our Austin and Cedar Park offices.

Kristen Pickering, MD

Kristen Pickering was born and raised in Houston, Texas. In 2008, she graduated from Texas A&M University where she received her Bachelor of Science degree in Genetics & Chemistry. In her college years, she worked as a tutor in math and algebra and spent multiple summers as a counselor at Camp Independence, a week-long retreat for children with Type I Diabetes in San Antonio, Texas. After college, she attended medical school at the University of Texas Medical Branch in Galveston from which she graduated in 2012. In 2015, she completed her pediatric residency training here in Austin at Dell Children’s Medical Center at the University of Texas Dell Medical School. During her residency, she was involved in the Texas Pediatric Society as Resident Chair for the committees on Early Childhood Development and Childhood Obesity. In 2015, she joined North Austin Pediatrics. In addition to quality primary care, Dr. Pickering has special interests in childhood growth and development. In Dr. Pickering’s time away from the office, she enjoys exploring Austin’s parks and trails with her husband, Kyle, an engineer. The two have a daughter, Kylie. Dr. Pickering is certified by the American Board of Pediatrics and is a Fellow of the American Academy of Pediatrics. She sees patients in our Cedar Park office.

Laura Chesley, MD

Laura Chesley was born and raised in Atlanta, Georgia. She attended the University of Georgia where she received her Bachelor of Science degree in Biology & Psychology in 2006. While in school, she traveled to Ecuador to work with a physician treating children in Quito. Dr. Chesley attended medical school at Medical College of Georgia in Augusta and graduated in 2011. Upon completing medical school, she moved to Norfolk, Virginia where she completed her pediatric residency at Children’s Hospital of The King’s Daughters in 2014. During residency, she made several international trips to provide pediatric care in Belize and Haiti. Following residency, she moved to Fort Lewis, Washington to be with her husband, Patrick, a military service member. She practiced pediatrics at Madigan Army Medical Center prior to her moving to Texas. Upon returning to Texas in 2016, she joined North Austin Pediatrics. Her interests in pediatrics include breastfeeding and adolescent medicine. With lots of family in the area, they’re happy to now call Texas home. Dr. Chesley is certified by the American Board Pediatrics and is a Fellow of the American Academy of Pediatrics. She sees patients in our Cedar Park office.

Chelsea Johnson, MD

Chelsea Johnson was born at Bethesda Naval Hospital while her dad was stationed in Maryland as a navy pilot before moving to Keller, TX where she began springboard and platform diving. She was fortunate enough to represent the USA at Junior World Championships and continue diving as a Division I athlete for Purdue University. She developed a passion for medicine while in college and graduated with a Bachelor of Science degree in Health Science. She proceeded to the University of Texas Medical School at Houston followed by a pediatric residency at Yale University. During residency, she volunteered in the Yale Pediatric Refugee Clinic through which she made several international trips to hospitals in Brazil and Tanzania. Her passions are global health and newborn medicine. Chelsea joined North Austin Pediatrics in 2017, and she looks forward to life in Austin with her husband, Ian Patterson, who is also a pediatrician. The two have a cat, Rafiki (Swahili for friend––named after experiencing the beautiful language and people of Tanzania). Outside of medicine, Chelsea and her husband enjoy being active and outdoors. They support division rivals, Houston Texans and Indianapolis Colts; therefore, they expect to have marital hardship twice a year. Dr. Johnson is certified by the American Board of Pediatrics and is a Fellow of the American Academy of Pediatrics. She sees patients in our Austin and Leander offices.

Alyse Paull, FNP-C

Originally from Minnesota, Alyse found her way to Austin where she attended nursing school and met her husband, Jeff, a native Texan. Prior to her second year at Austin Community College, she traveled throughout Egypt on a medical mission trip. It was her work with local orphans and Sudanese refugees there that shaped her commitment to service. Following graduation from A.C.C., Alyse worked as a neonatal nursery nurse in Austin for nearly ten years. In that time, she completed her B.S.N. from the University of Texas at Arlington and her M.S.N. from Texas State, and she became board certified as a family nurse practitioner. She is an active member of the American Association of Nurse Practitioners, National Association of Pediatric Nurse Practitioners, and the nursing honors society, Sigma Theta Tau. As a new member of North Austin Pediatrics since 2017, Alyse is excited to fulfill her professional passions of helping new mothers learn to breastfeed and of practicing preventive care. When she isn’t caring for her patients, she teaches A.C.C.’s obstetrics clinical course. She sees patients in our Leander office.