Has a coach EVER gone from private to public and had at least equal success???
Rick Reinhart went 6-4 in the 2007 season at Alton Marquette. From there, he went to Tuscola where he went 8-4, 11-3, 12-2, and 11-3 in his first four years, a period in which his teams made three appearances in the finals, and winning the title once.
Bob Naughton left Loyola after the 1966 season after going 8-1-1 (7-1-2 and 10-1-2 in the previous two years). He had two undefeated seasons in his first three years at New Trier West.
Tom Powers' final season of coaching Loyola was in 1975 when he went 10-2 and had a semifinal appearance in 5A (the then largest class). In '74, his Loyola squad finished at 2-6. As the head coach at Evanston starting in 1980, he compiled regular season records of 7-2, 7-2 and then four straight years of 8-1. In his first three years as HC of the Wildkits, his teams failed to make the playoffs because the IHSA didn't allow as many teams to qualify back then like they do now. He won two CSL South conference titles and made it to the IHSA playoff quarters three years.