"expert in managing" is correct and perfectly usable in written English.
You can use it to describe someone's proficiency at managing certain situations or topics. For example, "John is an expert in managing promotional campaigns for our business."
The president is C.E.O. of the most complex organization on earth, the federal government, and must also become expert in managing foreign policy.
So those expert in managing and minimising risk by packaging loans into securities and selling them on, for example can get away with a thinner cushion than others.
He began his career at Bell Telephone Labs, birthplace of the laser and transistor, and later became an expert in managing complex software projects, a field notorious for spiralling costs, missed deadlines, and clashing egos.
Companies have become expert in managing worldwide operations.
The top CIOs are becoming expert in managing change in the context of enterprise outcomes, not just technology outcomes.
Editor's note: Guest author Ohad Samet is an expert in managing fraud and other risks in payments systems.
United States Military Group officers, experts in managing natural disasters, set up command posts with the Honduran government emergency management people even as the hurricane blew ashore.
Today it's double that and beyond, and guys like John are experts in managing a fighter's weight through a camp to take advantage of the system".
However, it's unlikely there will be a shortage of products on the shelves as the supermarkets have become experts in managing supply risks and seasonal volatility.
The tool was tested by 22 experts in managing entries in confined spaces, including experts during 10 visits in different organizations.
Reinsurers, which are in the business of insuring insurance, are experts in managing risk and rarely get caught off guard.
