Liesl Hartmann, MA CCC/SLP, BCS-CL

Pediatric Speech Language Pathology, DIR/Floortime - Washington DC

 "Liesl's insights about children are illuminating..."  Barbara Kalmanson, PhD, Clinical Pediatric Psychologist 


Developmental Speech and Language Therapy


About Liesl

Hello! I am a DIR/Floortime trained and Board Certified Speech Language Pathologist. I have been working with children since 2001 in the San Francisco Bay Area, and now in Washington, DC.  I truly enjoy helping children reach their full potential to become more effective communicators, learners and friends. I ran a private practice in San Francisco from 2005-2018, and am thrilled to have opened a new office this year in Chevy Chase, DC.

Find out more about my experience here

Expert Level, Play-Based, Speech/Language Therapy

I specialize in working with children with language disorders and social learning challenges and am one of less than 100 Board Certified Language Specialists in the nation. I have trained with both the ICDL and Profectum organizations in DIR/Floortime techniques for over 18 years. I also have extensive training in SCERTS, Social Thinking, PROMPT, Linda-mood Bell, Hanen and the Kaufman Apraxia approach. I love working with parents and caregivers and have presented trainings to many schools, parent groups and fellow speech pathologists. 

learn more about developmental therapy here

Relationship Based and Individualized

I build strong and positive relationships with each of my students and focus on helping them grow in their self-esteem and confidence as well as their speech and language capacities. I believe in focusing on each child's strengths and build a meaningful, individualized program unique to their profile and their family situation. I love supporting families and working in tandem with parents as well as the other professionals on the student's team.

Read my full philosophy statement here

Services Offered

Individualized Therapy


I offer individualized therapy for children in office, home and school settings.

Group Therapy and In-Class Support


I have worked extensively with preschools and elementary schools - supporting children's language and social development. I love helping teachers and staff learn new techniques to facilitate further social and language growth for their students.

Parent Coaching and Support


As a DIR/Floortime provider - and as a mom myself -  I know how to support parents on their journey of learning and growing along with their child.

Testimonials from Clients


Rosa, parent of two children with autism

"Liesl let me participate in her sessions and always provided techniques for us parents to apply. Now my boys are where we never thought they would be: they can communicate and they have friends! Thank you, Liesl, for your contribution in bringing back our two boys."

Peter, parent of 11 year old child with social learning challenges

"We found Liesl to be a consummate professional who cares deeply about her clients.  She brings an impressive depth of knowledge and great empathy to her speech pathology practice; in  addition, Liesl places her everyday therapeutic work in the context of children's sensory and cognitive challenges.  She has a genuinely open and warm way with kids (our son really loved working with her), and works well with parents, teachers, and other therapists as part of a caregiving team.  We feel truly lucky to have found such a dedicated, professional, and kind speech pathologist for our son." 

Rebecca, parent of child with sensory processing and articulation challenges

"Liesl is did a fantastic job with our 5 year old. After a negative  experience with a previous speech therapist, we were looking for a  therapist who had alternatives to the traditional 45-minutes-in-a-seat  structure. I knew I had found the right place when her therapy room was filled with toys and a trampoline. Liesl engaged our son by  drawing on his interests (saying the "K" sound was much more fun when saying, "Luke Skywalker") and using games, interspersed with other interesting techniques like using whistles for correct mouth positioning. She collaborated with our son's long-time occupational therapist, and, most importantly, she taught me many small ways to help our son with speech on a daily basis "

Samantha, parent of a 5 year old child with autism

"I was referred to Liesl Wenzke Hartmann when my son was 2 1/2 years old  by an SLP I highly respect.  I was already fragile from just receiving  his autism diagnosis, so when his speech therapist, whom I adored, told  me he would be better served by another SLP, I was devastated. That all changed once I took my little guy to meet Liesl and Laura.  Their child-directed, floortime style of therapy is so gentle and intuitive.   Before I knew it, my son, who had only a handful of words/sounds, was engaged and initiating back and forth interactions.  All through play.   I can't really describe what took place in the sessions, they were fun for him and drew him out of his shell.  It was magical.  He made so many  breakthroughs and developed the foundational skills he needed to  benefit from traditional adult-directed speech therapy.  He is 5 now, a sweet little chatterbox."  

Ann, parent of a 2 year old child with speech delays

 "My son still asks about Liesl, she has a real gift for children." 

Testimonials from Colleagues


Barbara Kalmanson, PhD, Child Psychologist

"Liesl's insights about children are illuminating, and her sensitivity to the needs of the family is always well-tuned. She envisions communication as a dynamic developmental process encompassing capacities for play, intimacy, flexibility, and spontaneity."

Sima Gerber, PhD CCC/SLP, Queens College

 "Liesl and I have talked about many children and families together and I have always been impressed with the sensitivity she shows to the ‘big picture’ and the challenges that the parents are facing." 

Susan Dambroff, Special Educator, SFUSD

"Working with the individual needs of each child, Liesl develops hands-on functional and play-based strategies that can be used across home and school environments." 

Jordan Sadler, MS CCC/SLP, Northwestern University

"Liesl is a compassionate and bright therapist. She approaches each child as a unique individual and understands that the child is a part of a family system and cannot be treated adequately apart from that system."

Stephanie Pass, PhD, Child Psychologist

 "I highly recommend Liesl, she is a thoughtful and creative therapist who is deeply devoted to her work." 

Rebecca Hendricks, MA OTR, Occupational Therapist

"I feel confident that children are in good hands when they are seeing Liesl." 

Let's Connect!

Drop me a line!

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Call or email, any time

I love to connect with families and professionals so feel free to call or email with any questions. We can discuss your child or client's needs and ways to support them.

Office, Home or School visits available

Military Rd NW and 30th, Washington DC

(415) 310-6269