Gilsenan and Costa


Our practice provides comprehensive therapeutic services that integrate the most effective and current evidence-based tools and programs to best meet your child’s individual needs. We strive to create a fun, comfortable, and safe environment that encourages your child to explore, learn, and grow. Through ongoing collaboration with families, schools, and the community, we are also committed to ensuring the successful transfer of targeted skills to your child’s daily life.

- Kimberly and Jamie

Our Services

Speech-Language Services


Receptive and Expressive Language

Pragmatic Language Skills

Executive Function


Feeding Therapy

Pre-Reading Skills

Occupational Therapy Services

Gross Motor Skill Development

Fine Motor Skill Development

Sensory Processing

Interactive Metronome

The Listening Program


Executive Function

Our practice offers a full sensory gym and dedicated fine motor and speech-language therapy rooms. We also provide formal and comprehensive occupational and speech-language evaluations, classroom consultations, faculty development workshops, parent workshops, and social skills groups.

We are trained to utilize a number of specialized methods including: PROMPT, Kaufman Method, The Listening Program, Social Thinking, Zones of Regulation, Handwriting Without Tears, Sounds in Motion, and more.

Meet the Therapists

Kimberly Gilsenan

Kimberly Gilsenan is a licensed speech-language pathologist and co-founder of Gilsenan and Costa Center for Occupational and Speech-Language Therapy in Greenwich, CT. She received her Master’s degree in Communication Disorders from Northwestern University. She has since been providing comprehensive speech-language evaluations, screenings, and therapy for more than 20 years. During this time, she has treated children, some of whom diagnosed with Autism Spectrum Disorder, Attention Deficit (Hyperactivity) Disorder, Apraxia, Cerebral Palsy, mixed receptive-expressive language disorders, stuttering disorders, articulation disorders, and weaknesses in the social pragmatics and executive functioning. She specializes with children ranging from toddler to school aged and has had the opportunity to work in a variety of settings, including outpatient hospital and clinical settings, private schools, Early Intervention, and private practice.

Presently, Kimberly devotes her time to her private practice and regular consultations with many professionals and schools in her area. In the center, she provides individual therapy, small group therapy and runs larger groups in collaboration with an occupational therapist. She has extensive experience building social skills, executive functioning skills, language processing/comprehension, word retrieval abilities, written/oral expression, fluency, articulation, and pre and early reading skills. She also works closely with children experiencing oral-motor weakness and/or feeding concerns. Kimberly prioritizes the advancement of her skills by pursuing continuing education in her specialty areas. She has been fortunate to participate in a number of conferences and courses with the leading experts in her field. She is currently trained in many evidence-based programs including PROMPT, Kaufman Method, Social Thinking, Zones of Regulation, and Linda Mood-Bell's Visualizing and Verbalizing. She has also attended courses at Windward School to develop skills in teaching expository writing and multisensory reading and has participated in conferences run by the Stuttering Foundation of America.

Jamie Costa

Jamie Costa is a licensed occupational therapist and co-founder of Gilsenan and Costa Center for Occupational and Speech-Language Therapy in Greenwich, CT. She received her Master’s degree in Occupational Therapy from Mercy College. Jamie also has a Master’s degree in Early Education from Fordham University. Jamie has been providing comprehensive pediatric occupational therapy services for more than 10 years. She has experience treating common pediatric and adolescent conditions including: Attention Deficit (Hyperactivity) Disorder (ADD/ADHD), Cerebral Palsy (CP), Autism Spectrum Disorder (ASD), Developmental Coordination Disorder (DCD), and Sensory Processing Disorder (SPD). She has worked in a variety of settings including schools, private practice, and home care. Prior to entering the field of occupational therapy, Jamie was an early childhood teacher in both the public and private school setting. Jamie has also served as an adjunct professor for the Mercy College Graduate Occupational Therapy Program, specifically teaching assessment and treatment of the pediatric population.

Jamie currently dedicates her time to private practice both at her clinic and at several private schools. In the clinic, Jamie provides individual therapy, small group therapy, and also leads social skills groups in collaboration with a speech language pathologist. In the school setting, Jamie provides individual therapy, small group training for motor skills and executive function, and teacher development programs. She specializes in sensory processing skills, gross and fine motor skill development, handwriting, and executive function. Jamie is dedicated to providing evidence-based treatment and is committed to continued education. She has received extensive training in sensory processing, including a mentorship at the Star Foundation in Colorado. Jamie is also trained in the Zones of Regulation, Handwriting Without Tears, Size Matters Handwriting Program, Interactive Metronome, The Listening Program, and Social Thinking.

Courtney Powers

Courtney joined the Gilsenan and Costa team in January of 2016. She has worked in special education since 2009. Courtney earned her Master of Science degree in Occupational Therapy from Sacred Heart University in 2015. She has worked in both public and private school settings, treating children with a variety of developmental and physical challenges including Attention Deficit/Hyperactivity Disorder, Autism Spectrum Disorder, Cerebral Palsy, Down syndrome, Traumatic Brain Injury, Sensory Processing difficulties, Executive Function disorder, and visual processing difficulties. Courtney has received training in Handwriting Without Tears®, the Zones of Regulation, Brain Gym®, and sensory integration strategies. She has extensive experience with Individualized Education Programs (IEP).


"To find speech and occupational therapists who are amazing at what they do, are kind, energetic and genuinely care for your child's entire well-being is not an easy thing. Luckily for our family, we have found such speech and occupational therapists in Kim Gilsenan and Jamie Costa, respectively. We began with them when our son was 22 months and we are so blessed to have had their support on our journey. They have worked tirelessly with our son, helped to reveal his strengths and worked through challenges on all levels -- speech, fine/gross motor skills, play and social skills. They have been, and are his greatest advocates and we recommend them wholeheartedly without reservation."

"I refer to Gilsenan and Costa as my dream team! They have been there for all three of my children. From handwriting, to speech and to feeding issues, they have the knowledge and compassion to help. They truly get my kids and their needs. I know because I have seen positive changes in their development. Gilsenan and Costa are not only therapists. They are true friends to my family."

"Today, my daughter completed a tree top high-ropes course 60 feet off the ground all while chatting up the adults around her giving them instructions on how to complete the challenges. This is the same girl who three years ago was afraid of ceiling fans, slouched and refused to speak. Thanks, Kim and Jamie for everything you’ve done for her!"

"The therapists at Gilsenan and Costa have a remarkable ability to craft programs that are simultaneously substantive and stress-free. My son not only improves continuously, but also looks forward to his sessions every week, both of which are critically important to me."

Contact Info

For more information about the services offered at Gilsenan and Costa, please contact:

Kimberly Gilsenan, MA, CCC-SLP

Speech-Language Pathologist

Jamie Costa, MS, OTR/L

Occupational Therapist
(203) 388-5550



Suite 100
100 Melrose Ave
Greenwich CT 06830

From the North:
  • From I-95, take exit 3.
  • At the bottom of the exit ramp, make a right onto Arch Street.
  • After passing under the railroad tracks, make a left onto Railroad Avenue
  • Railroad Avenue becomes Old Field Point Road which becomes Hamilton Avenue. From Hamilton Avenue, make a right onto Artic Street.
  • There is a stop sign at the bottom of the hill. Make a right onto Melrose Ave and the Center will be on your left.
From the South:
  • From I-95, take exit 2.
  • Continue straight on Doran Avenue, then make a left onto Byram Shore Road.
  • At the light, make a right onto Richie Avenue.
  • Richie Avenue becomes Hamilton Avenue. At the next light, make a left onto Artic Street.
  • There is a stop sign at the bottom of the hill. Make a right onto Melrose Ave and the Center will be on your left.