Thank you for supporting the 2026 Chicago Marathon participants, the CdLS Foundation, and the wonderful families we serve.

As the only organization in the nation dedicated to individuals impacted by CdLS, we depend on the support of generous people like you. Your donation enables us to continue providing essential services to children and adults living with the challenges of this spectrum disorder.

You are making a difference!

We are incredibly grateful to you and will use your gift to promote early and accurate diagnosis, encourage research, and provide family support to all affected by CdLS. Your generosity underwrites services like free in-person medical clinics, help lines, informational resources, and family gatherings, to name a few.

Thanks to you, we can further our mission of reaching out, providing help, and giving hope to people affected by this rare genetic spectrum disorder.

Your compassionate support truly makes a difference!

Warm Regards,

Bonnie Royster, Executive Director

This letter serves as a receipt for your charitable contribution to the Cornelia de Lange Syndrome Foundation, Inc. and certifies that you have received no goods or services in exchange for this contribution. Every effort has been made to ensure the accuracy of this receipt. If you believe we have made an error, call 800.753.2357 or email director@CdLSusa.org so we may correct it to your satisfaction.

2026 Team CdLS Chicago

By Cornelia de Lange Syndrome Foundation, Inc.

2026 Team CdLS Chicago

to benefit the CdLS Foundation

Team Members