"diligent manager" is a correct and usable phrase in written English.
You can use it when you want to describe someone who is meticulous and hardworking at managing tasks. For example, "John is an incredibly diligent manager - he always ensures that tasks are completed on time and to the highest standard."
He is, of course, often compared with his predecessor, Margaret M. Heckler, and department employees who have worked for both secretaries say he strikes them as a more diligent manager, more attentive to the smooth operation of the agency.
And if a newly-fired ex-member of staff is seen heading for the exit with a stack of blueprints in one hand and the passwords to the company intranet in the other, any diligent manager should by all means arrest their progress and ask to check their pockets.
Mayor Rudolph Giuliani and Harold Levy, the interim New York City schools chancellor, have not formally met to discuss policy in the two months Mr. Levy has been on the job, This may be due to the fact that Mr. Levy was appointed over Mr. Giuliani's objections, even though the chancellor seems to be the diligent manager the mayor said he needed.
A diligent manager, Daryl brought me his trading journal and asked me to read through his latest entries.
David was more than a fine ballplayer and a diligent manager.
I have to do more research". I was a very diligent HR manager.
I will miss him as the very thoughtful and diligent assistant manager he proved to be over the past few seasons".
A diligent cybersecurity manager will keep IoT devices and network security clearly in focus as part of the entire threat horizon.
Would that mayors just ran things, were diligent city managers instead of urban royalty.
The first kind, stray packet, is more likely, but not frequent enough to draw attention of diligent system managers.
"She was very diligent," animal hospital Manager Kathryn Schneider said.
