Family Center for Asthma and Allergic Diseases

Karen Grisham, Office Manager
Karen has been with Dr. Sim from the very first day the practice opened, November 13, 1995. She made Friendswood her home in 1988, where she raised her three daughters with husband, Kenny. When she is not working, you can find Karen on the tennis court or watching one or more of her nine grandchildren who all live in Friendswood.

Mandy, Cindy, & Charla

Nursing Staff

Mandy Rea

Mandy started working with Dr. Sim the summer of 1996. She resides in Friendswood with her two boys. When not at work, Mandy enjoys attending her sons’ activities, volunteering for her church and spending time with family and friends.

Cindy Ledezma

Cindy joined our team in 2019. She lives in Friendswood with her husband and four daughters. She is fluent in English and Spanish . Outside of work, Cindy likes spending time with her family.

Charla Buras

Charla has been on staff since 2017. She has been in the asthma/allergy specialty for over ten years. Charla oversees all of our infusions for patients with common variable immune deficiency.


Elisa & Cynthia

Front Office Staff

Elisa Field

Elisa started with our office in1997. She lives in Pearland with her husband. Elisa enjoys crafting and knitting in her free time.

Cynthia Ballou

Cynthia was a Respiratory Therapist and joined our team when she moved to the area to care for her family in 2016. She enjoys volunteer work for the community and sharing her faith with others.