Kevin Moynihan has spent the last two years working on an administration license to add to his teaching degree.
With new opportunities on his horizon, the Whiting girls basketball coach submitted his resignation after seven seasons with the Oilers.
"It was time for me to do something different," said Moynihan, who had a 93-61 record at Whiting. "It's time for me to start looking in other directions."
His team won a sectional title in 2013 and played in the title game three times, including a loss this season to Bishop Noll.
In seven years he had just two losing seasons with the Oilers.
Whiting is also searching for a volleyball coach, with the unrelated resignation of volleyball coach Kelly Greer.
Greer coached the volleyball team to a sectional championship in 2007, and left for one season in 2010 only to return in 2011. The Oilers played in the Class 2A volleyball sectional final games the last two seasons.
Whiting athletic director Paul Laub said that he hopes to have replacements in place as soon as possible.
"Because teams are going to start doing things during the summer, instead of calling kids back to meet their coach, we'd like to have someone to get with these kids and set up workouts and summer leagues," Laub said.
Laub added that both coaches would be hard to replace, helping set new standards within the Whiting programs.
"Both of them, just quality coaches," Laub said.
The School City of Whiting has teaching openings, Laub said, so there is potential to find a basketball or volleyball coach among the teaching candidates.
"We always look for the best teacher first," Laub said, "but if there's a qualified coach in there, that would be a help."