Baltimore Mayor Catherine Pugh has replaced the city's top information technology officer.
Pugh said Wednesday that she accepted the resignation of L. Jerome Mullen on Tuesday. Mullen held the position for about three years. His salary was $163,200.
Evette Munro, who had been deputy director of the office, has been named acting director. She joined the city government in November 2015 and earns $144,288.
Pugh declined to offer details about Mullen's reason for leaving. The administration did not immediately provide a copy of his resignation letter.
"That's a personnel matter and I don't discuss personnel matters," Pugh said.
Efforts to reach Mullen were not successful.
Pugh expects to immediately begin searching for a replacement.
The Mayor's Office of Information Technology has been marred by various controversies in recent years. Its last two directors left amid scrutiny.
Christopher Tonjes stepped down in June 2014 while the city's inspector general investigated allegations that the department paid contractual employees for work they may not have performed. Tonjes, who vehemently denied any wrongdoing, was never found to be involved in any misconduct.
Before that, then-director Rico J. Singleton resigned in 2012 after the release of a New York state audit that found he negotiated jobs for his girlfriend and himself while working for that state's information technology office.
Mullen joined the office in 2011 as director of information technology infrastructure and enterprise services. According to his online biography, he directed and managed the launch of the city's new website.
Mullen is not the first high-profile person to leave Pugh's senior leadership.
Embattled Housing Commissioner Paul T. Graziano resigned in December after Pugh pledged to replace him.
Anthony McCarthy, a Pugh spokesman, said the mayor wants to expand the information technology office's role by providing the public with more access to city services and making it easier for people and businesses to interact with city agencies.
McCarthy said Pugh will also be searching for a director who can "bring stability to the office."