Who Was The First Man To Make Trainers ?

The word 'trainers' can be used for different kind of things and you can use it for trees, plants and flowers and also for the aircraft that is used for the training of flying. The way you have used the question it seems that you are talking about the aircraft and it was Edwin C. Link who is believed to provide the first trainers way back in the year 1931.

The man was a man with a mission and he left even his father's business to establish his own business. When he learnt flying, he was quite thrilled about the prospect of flying and start envisioning a device that could allow pilots to ground safely while taking their preliminary lessons.   

It was this vision of his that bore the fruit and he started producing trainers.