Discredited by who?
Job Michael Evans, who was originally an advocate of Cesar Millan and the Alpha Roll, and who has subsequently apologised for helping to popularise it.
Dr Ian Dunbar, one of the most respected names in dog training and psychology, who studied the social behaviour of dogs for nine years.
Dr Ray Coppinger, biology professor, co-founder of the Livestock Guarding Dog Project, respected author of many books on dog behaviour and training.
Victoria Stilwell and David Montgomery of the UK Animal Behaviour and Training Council.
Patricia McConnell, Dr Sophia Yin, Dr Andrew Leuscher, Dr Suzanne Hetts, Dr Nicholas Dodman; all eminent and highly-regarded trainers and authors.
Anyone who practises counter conditioning and positive reinforcement.