Meet the Team

We help you and your child through all the transformations from 0 to 21 years of age.

Christine L. Chen, MD

Christine L. Chen, MD

Voluntary Clinical Assistant Professor of Pediatrics

Castle Connolly Top Doctor®

Board Certification: Pediatrics

Medical Degree: Saint Louis University (2005)

Residency: Cardinal Glennon Children’s Hospital (2008)

Personal: Dr. Chen enjoys experiencing the many activities St. Louis has to offer with her husband and two children. She likes to hike and to spend time outdoors.  She also enjoys running, swimming, gardening, and traveling.  She is thankful for the privilege of caring for your children and watching them grow.

Matthew Camden Hosler, MD

Matthew Camden Hosler, MD

Voluntary Clinical Assistant Professor of Pediatrics

Castle Connolly Top Doctor®

Board Certification: Pediatrics

Medical Degree: University of Missouri (2007)

Residency: Cardinal Glennon Children’s Hospital (2010)

Personal: In addition to being devoted to providing medical care for children at Monarch Pediatrics, Dr. Hosler is an avid chess player, amateur artist and comic book enthusiast.  In his free time, he enjoys reading, spending time with his wife, two teenage children and dog, and occasionally entering a chess tournament or making a mini comic book with his daughter.

Ellen M. Nicastro, MD

Ellen M. Nicastro, MD

Voluntary Clinical Assistant Professor of Pediatrics

Board Certification: Pediatrics

Medical Degree: Saint Louis University (2004)

Residency: Cardinal Glennon Children’s Hospital (2007)

Personal: Dr. Nicastro enjoys an exciting life with her husband and teenage boy/girl twins.  She and her husband enjoy finding all the cool free stuff to do with their kids on any given weekend (when they aren’t already busy with their kids’ extracurricular activities).  She is an occasional runner that enjoys techy stuff and office supplies.  She is also very passionate about pediatrics and loves being gifted the opportunity to help your children grow up healthy and happy.

Laird Henry Vermont, MD

Laird Henry Vermont, MD

Voluntary Clinical Assistant Professor of Pediatrics

Board Certification: Pediatrics

Medical Degree: Saint Louis University (1993)

Residency: Indiana and Purdue at Indianapolis (Riley Children’s) (1996)