The phrase "administer jointly" is correct and usable in written English.
It can be used in contexts where two or more parties are managing or overseeing something together, such as a project, program, or resource.
Example: "The two organizations will administer jointly the new community health initiative to ensure its success."
Alternatives: "manage together" or "oversee collaboratively".
Boris Yeltsin agreed that the fleet would be administered jointly for a three-year period.
Badiar National Park, which is administered jointly with Niokolo-Koba National Park in southeastern Senegal, contains savanna and forest.
This plan, the American Federation of Musicians and Employers Pension Fund, is administered jointly by the national musicians' union and some 7,000 employers.
The fund, which would need Congressional approval, would be administered jointly by the Departments of Labor and of Education.
The Mocatta Library is administered jointly with the Jewish Historical Society of England, of which Mocatta was president from 1900 to 1902.
The party was given under the rubric of the newly announced Arthur Schlesinger, Jr., Fund, which is to be administered jointly by the Franklin D. Roosevelt and John F. Kennedy.
The family's statement followed reports in the last week that Boogaard was in the substance abuse rehabilitation program administered jointly by the league and the union.
From its inception the Palomar Observatory was administered jointly with Mount Wilson Observatory as the Hale Observatories by a consortium created by Caltech and the Carnegie Institution of Washington.
A similar approach has been adopted elsewhere, including rural areas, with the establishment of syndicats intercommunaux that allows services to be administered jointly by several communes.
Neither side would declare sovereignty over the city's holy places; they would be administered jointly with the assistance of Jordan, Saudi Arabia and the United States.
