In Flowers for Algernon, who suggested that Charlie should be a part of the experiment in the first place?

We are never actually told specifically who suggested
Charlie would be a suitable subject for the experiment that changes his life so
drastically. However, there are hints that we can pick up that suggest that Dr. Strauss
contacted the Beekman School for Retarded Adults and spoeke to Miss Kinnian to ask for a
suitable candidate. Notice how in the third progress report, Dr. Strauss tells Charlie
that Miss Kinnian had given them a report about him:

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He said Miss Kinnian tolld him I was her bestist
pupil in the Beekman School for retarded adults and I tryed the hardist becaus I reely
wanted to lern I wantid it more even then pepul who are smarter even then
me.

Thus we can infer that
Dr. Strauss and his scientific team contacted the school and asked for a potential
candidate that they could use for a suitable case study. Miss Kinnian, who is obviously
impressed with Charlie and his dedication to his studies, suggested his name, which is
how Charlie found himself the subject of this intelligence
experiment.