DLH promotes finance chief JohnBull to CEO
DLH's soon-to-be CEO Kathryn JohnBull has been the company's chief financial officer since 2012. DLH Corp. photo.
By
Ross Wilkers
The board of directors also elevates a new chief financial officer as CEO Zack Parker retires from the position.
DLH Corp.’s board of directors has promoted a new chief executive from within the technology services company’s own ranks in Kathryn JohnBull, who has worked in the chief financial officer role since 2012.
The transition is effective immediately and she succeeds Zack Parker, who has led DLH as CEO since 2010 and has retired from the position. Parker will stay on the board of directors and continue to support DLH in certain strategic growth pursuits as a consultant starting in October, the company said Tuesday.
In conjunction with that move, DLH’s board has also elevated Steve Oroho to CFO from his current role as senior vice president of finance and accounting. Oroho has worked in that role since he first joined DLH in 2018.
Parker has led DLH through significant expansion during his tenure as CEO, which started in a year when the company posted $35 million in revenue. DLH recorded $344.5 million in sales for its most recent fiscal year, which ended Sept. 30, 2025, and touted a 2,300-person workforce in its FY 2025 annual report.
Acquisitions were a key tool of growth for DLH under Parker’s leadership, highlighted by the $178 million purchase of Grove Resource Solutions Inc. in 2022. DLH made that move to position for larger IT and engineering contracts at federal agencies.