Our Speech & Language Pathologists

Oak Tree Developmental Center’s speech and language pathologists are experts in the evaluation and treatment of expressive and receptive language, articulation/phonology, oral motor, feeding, social pragmatic skills and sensory integration.  Our speech language pathologists treat all aspects of communication from a baby’s first attempt to communicate to a child’s ability to socialize and interact with peers.  They work closely with families and collaborate with teachers and other disciplines to ensure the most effective intervention possible


Mary Lee, M.A., CCC-SLP/L

Mary has been practicing for over 20 years and is co-owner of Oak Tree Developmental Center.  She has worked within the school and private practice.  She is a dedicated professional who enjoys working with children and their families.  She encourages them in a caring manner to achieve their goals.  Mary has extensive experience in the diagnosis and intervention of children with a variety of communication disorders including receptive and expressive language, autism, apraxia of speech, oral motor and articulation.  She has additional training in PECS, DIR Floortime, TEACHH, PROMPT and Social Thinking.  Mary obtained a Bachelor’s degree in Audiology and Speech Pathology from Michigan State University and a Master’s degree in Speech Language Pathology from Northwestern University.  She is a certified member of the American Speech Language Hearing Association (ASHA) and holds a teaching certificate with the Illinois State Board of Education.  She is a certified pediatric specialist and evaluator for Early Intervention in Illinois. 


Carlin O'Day, M.S., CCC-SLP/L 

Bio coming soon!


Katherine Reynolds, M.A., CCC-SLP/L

Katherine received her Bachelor’s and Master’s degrees from the University of Illinois Urbana-Champaign and has been working at Oak Tree Developmental Center since 2010.  She has experience working with a variety of disorders including autism spectrum disorders, childhood apraxia of speech, articulation/phonology, fluency, genetic/chromosomal syndromes, and expressive and receptive language delays and deficits.  Katherine enjoys leading multiple social groups for both preschool and school aged children at Oak Tree.  Targets of the social groups revolve around strengthening pragmatic language, problem solving, teamwork and collaborative play.  Katherine’s continuing education experiences include:  Social Thinking, PECS Basic Training, and she has completed training for the SOS Feeding approach.  She is a member of the American Speech Language Hearing Association (ASHA).


Alexandra Danekas, M.S., CCC-SLP/L

Alex has been with Oak Tree Developmental Center since 2013.  She has extensive experience in the areas of expressive and receptive language, autism, social/pragmatic language, feeding, fluency and articulation disorders.  Alex provides therapy that is tailored to each child’s individual and unique goals and uses a wide variety of therapy techniques to achieve optimal progress.   Her welcoming and positive approach to therapy allows children to be comfortable and blossom during their therapy sessions.  Alex is a certified Early Intervention specialist and has training in therapeutic intervention to address physiological and motor-based speech disorders.  She has her Bachelor’s from the University of Illinois and her Master’s in Speech Language Pathology from Illinois State University.