He worked as New York City police officer. He was more laid back than his wife. He felt that he could not assert his authority as a parent because Donna would always undermine his and Cathy's authority. Jo was impressed by his candor in laying out the problems in the household. He thanked her deeply for pointing out that Katelyn was too old to not be potty-trained.
Steve is also notable for getting "kicked where it hurts" by Amanda when trying to guide her back to timeout. He lay curled up in agony under the dining table until Jo found him. He laughed through his pain and noted that he'll turn his body away from Amanda the next time he is walking her to timeout.
He was 35 on Supernanny and is now 46 in 2016.