The phrase "whose handling" is correct and usable in written English.
You can use it when referring to something owned by someone, often in the context of an action performed by the owner. For example: "The driver was proud of his car, whose handling was smooth and responsive."
They benefited from an uncharacteristically sloppy start from Ospreys, whose handling errors denied them a try as a Josh Matavesi knock-on meant Dan Baker's effort was disallowed.
Anthrax, Ebola, and smallpox are all dangerous pathogens that belong to a list of so-called select agents whose handling and storage are subject to special government regulations.
Doers and doings in business, entertainment and technology: Employees and investors waited Thursday for the board of AMR's American Airlines to decide whether to seek bankruptcy coverage and whether to keep Chief Executive Donald J. Carty Donald J. Carty, whose handling of executive perks drove a labor backlash that menaced vital cost-cutting agreements reached last week.
Kan, whose handling of the crisis drew widespread public criticism, said Washington had also grown frustrated with his government's response.
The NFL commissioner, Roger Goodell, whose handling of the Rice case has been widely condemned, has been a strong backer of the International Series games at Wembley.
Mr. Kerry's position on Israel was a rare point of agreement with the president, whose handling of Iraq Mr. Kerry called "stunningly ineffective".
Mrs. Ayala, whose handle was Pink Lady, elaborated.
But Mr. Ebert — whose handle was @ebertchicago — never tweeted during a movie.
Commenter Winterwhile2, whose handle is nice, thinks the president will call for more taxes.
However, Ms. Phillips does pass along remarks on Twitter from an actor named Michael B. Jordan, whose handle is @michaelb4jordan.
A notable example of 1737 is a cup whose handles are in the form of realistic snakes.
