Randy Corn, who has been with the corporation since the fall of 2009, submitted his resignation but will serve until the end of the year.
"I'd like to formally thank him for his years at Greencastle," Supt. Lori Richmond said.
Following the meeting, the superintendent also expressed her appreciation that Corn's resignation will not take effect until summer.
"We're happy he's staying for the rest of the year," Richmond said. "We look forward to a good second semester. He'll be here continuing to work with our students."
Richmond highlighted some of the progress the high school has made in Corn's two-plus years, including the addition of an alternative school, more extra-curricular activities and increased graduation rates.
Corn came to Greencastle following 25 years at Brownsburg High School, 18 as an English teacher and seven as an assistant principal.