Presumably you are talking about Dr. Andrew Wakefield.  His study said specifically that the finding are NOT proof of anything, but that further research is needed.

Wakefield did NOT 'develop his own measles vaccine'.  That's a total fucking lie.  He started to be involved in development of a test for (the rapidly increasing number of) people with Cron's disease.  His specialty was gastrointestinal medicine and the study he did associated with MMR was triggered by a bunch of people showing up with almost identical and severe problems in young children which seemed to come about suddenly after receiving the MMR shot.

Resistance to his study was stated in plain language that it would threaten the government run 'public health' agency in the UK and their plans to adopt exclusively the three-in-one MMR vaccine.  All Wakefield ever said was that until further study it would be safer to take the three shots separately.

The establishment ruined Wakefield's career and made a model of it so that other scientists would be more careful to follow the party line.  Wakefield's co-author was wealthy and had half-a-million pounds to defend himself.  He was not only absolved of any wrongdoing but the high court came down very harshly on the lower court for their malfeasance.

Just want to set the record straight here.