Certifynd ABA

Willow ABA Services

place Littleton, CO 51-200 employees

star Founders

Tanner Sierks

CEO & Owner

Over a decade of experience in the ABA field; led the company's growth into a multi-state operation since its 2020 founding.

groups Executive Team

Tanner Sierks

Chief Executive Officer & Owner

Ariella Parker, Ph.D., BCBA-D

Chief Clinical Officer

Ph.D. in Education (Special Education, Disabilities, Risk Studies) from UC Santa Barbara; 20+ years specializing in early language acquisition and social communication.

Elle Phelps, BCBA

Chief Clinical Quality Officer

Master's degree from Ohio State University; BCBA since 2017; one of the company's founding clinicians (2020).

Sierra Lacey, MBA

Chief Operating Officer

MBA (2017); original team member since the company's 2020 founding.

Kayla Browne, BCBA

Regional Clinical Director

Abigail Cattron, BCBA

Lenexa Clinical Director

Katie Hancock, BCBA

Wilmington Clinical Director