 As the foremost force on the Child Welfare Commission, concerned with issues of custody, orphanage, child support, and state wardship and institutions, Cotillo pushed a comprehensive reform through the legislature with the support of the social-welfare advocate Sophie Irene Loeb and the Hearst newspapers. His biographer, Nat Ferber, a former Hearst reporter, considered the reform to be "the outstanding achievement of Cotillo's career".
