Harford County Public Schools appointed Dyann Mack as interim superintendent after Sean Bulson was suspended with pay earlier this week.

Mack, a Joppatowne High School graduate, has worked with the school system for more than 30 years, most recently as deputy superintendent for academics, leading curriculum, instruction, professional learning and student support services.

She earned a doctorate in educational leadership from Walden University, a master’s degree in educational leadership from Loyola College, and a bachelor’s in early childhood and elementary education from Lincoln University.

Dyann R. Mack was appointed interim superintendent of Harford County Public Schools, effective Jan. 8, 2026. A graduate of Joppatowne High School, Mack has worked for HCPS for 30 years, most recently as Deputy Superintendent for Academics. (HCPS/Courtesy)
Dyann R. Mack was appointed interim superintendent of Harford County Public Schools, effective Jan. 8, 2026. A graduate of Joppatowne High School, Mack has worked for HCPS for 30 years, most recently as Deputy Superintendent for Academics. (HCPS/Courtesy)

“I look forward to working alongside our students, staff, families and community to foster safe and high-quality learning environments where every student and staff member can be seen, valued and heard,” Mack said in a Harford Schools news release.

Previously, Mack served as the executive director and director of elementary school instruction and performance. In that role she led and supported 34 elementary schools across the district and was in charge of strengthening instructional systems and expanding access to prekindergarten, among other things.

She began her career in Harford County Public Schools as a teacher at Prospect Mill Elementary, then became an achievement gap coordinator, assistant principal and principal.

Harford Schools has been in the limelight this week after the release of a recorded 911 call, allegedly made by Bulson in April 2024, reporting a theft of about $8,000 from his New Orleans hotel room. Bulson was attending an education conference in New Orleans at the time of the call.

On the Board of Education suspended Bulson as it attempted to launch an investigation into him. He is expected to be suspended for 30 days, according to former school board president Aaron Poynton.

Bulson’s current contract ends June 30.

Poynton resigned from his position on Thursday, saying he had taken a chief executive offer role that begins next week. County Executive Bob Cassilly will be tasked with filling the board president vacancy. Poynton had served in that role since 2023.

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