By far it is al carius.
Others mentioned are good but none are even close to his record of success.
He gets his runners to overachieve. He is able to get top recruits even though north central is a very average school. North central doesnt benefit like williams, haverford, wash u from college rankings. It is a private school so he doesnt benefit from low public school tuition. North central doesnt have a monster endowment to assist in financial aid at the level of those other schools.
His success is incedible over more than 40 years and still going.
No offense to the many strong coaches but al carius is in a class by himself and i am not even an alum.