Kros is a career child advocate, who has served as a childcare worker, child abuse investigator, children’s home administrator, consultant, college professor, attorney, writer, and speaker. Kros is president of The Upside Down Organization and executive vice president of The Children’s Guild, one of the largest private providers of special education services in Maryland. Prior to joining The Guild, Kros practiced law with Luce, Forward, Hamilton & Scripps in San Diego, where his practice focused on children's issues. He also has served as vice president for curriculum and training at Alliance member Children's Square U.S.A. in Council Bluffs, Iowa; as a child abuse service officer for the Douglas County Juvenile Court in Omaha, Neb.; and as a family teacher at Alliance member Boy's Town.

Kros presents seminars to parents, educators, child-serving professionals, and their leaders on various topics including stress and the brain, brain-based learning, aggressive and violent children, attention-deficit hyperactivity disorder, neuroscience of the teenage brain, and brain-compatible organizational leadership. Kros was awarded a Maryland Governor’s Citation for his speaking efforts.

He co-authored the books Creating the Upside Down Organization: Transforming Staff to Save Troubled Children (2005) and The Upside Down Organization: Rethinking Group Care (2009).