Kirk Martin is an expert on strong-willed children and children with special needs. He offers very specific, practical strategies to stop the yelling, defiance, and power struggles that parents have with children. Celebrate Calm website has a blog, podcast, consultation services, lecture series for sale, and a listing of free educational events. There is also an ADHD University package that focuses specifically on practical, concrete steps that techniques that help children control their impulses, emotions, anxiety, and sensory issues.