He was a star of the original Wonder Years, yes. He had some popular kids movies in the 80s and 90s as well, but he became very quiet. I suspect he was one of those child stars whose parents actually took some level of responsibility for his life before he was old enough to handle it or understand.
Quiet? My understanding is he does a lot of directing, ads, voiceover, and some acting.
I have been watching the reboot and its pretty good. Really neat link to the original involving Winnie’s brother who died in Nam and the elders brother in this series.