Ross W. Greene is an American clinical child psychologist and author of the books The Explosive Child, Lost at School, Lost & Found, and Raising Human Beings. Greene developed the model of intervention called Collaborative & Proactive Solutions (CPS). He has a Ph.D. in clinical psychology. Greene is founding director of the non-profit Lives in the Balance, and developed and executive produced the documentary film, The Kids We Lose. Greene's research has been widely published in academic journals, and he and the CPS model have been featured in popular media including The Oprah Show, Dateline NBC, the CBS Morning Show, the Public Broadcasting Service (PBS), National Public Radio, The Washington Post, Mother Jones magazine, and The Atlantic.

Greene received his undergraduate degree at the University of Florida and his Ph.D. in clinical psychology at Virginia Tech in 1989. He completed his pre-doctoral internship at Children's National Medical Center in Washington, DC. His academic appointments include the Department of Psychology at Virginia Tech (1989-1991, 2012 to present), the Faculty of Science at University of Technology Sydney, Sydney, Australia (2016 to present); the Department of Psychiatry at Harvard Medical School (1992 to 2013), the Departments of Psychiatry and Pediatrics at University of Massachusetts Medical Center (1991-1992); and the Department of Education at Tufts University (2010 to 2013).

Though he originally called his model "Collaborative Problem Solving," he is not affiliated with those now marketing that product and does not endorse what they have done with his work.