McMeekin said he proudly considers himself a feminist and that he has tried to work for equality.
"But sometimes the best way for a man to advance the equality of women may be to step back and make room at the table," he wrote. "For me, this is such a time."
McMeekin was first elected to the Ontario legislature in 2000, and he has served in cabinet under Wynne and her predecessor Dalton McGuinty.