One of my high school Rabbis made my shidduch. After 9th grade, he moved and got a job teaching at my husband’s school, where he ended up teaching him in 11th and 12th grade. We were both still in touch with him when I came back from seminary (1 year out of high school for me, 3 years for my husband), and he suggested we go out. The rest, as they say, is history 🙂
Seriously, though, I only had him in 9th grade, but the reason I was still in touch with him 4 years later- and the reason he knew me well enough that he could suggest a shidduch- was that he was that special as a teacher and had that much of an impact.