"dual appointment" is correct and usable in written English.
It refers to holding two positions or roles simultaneously. Example: The professor was able to balance her dual appointment as a department chair and a research advisor with ease.
Dr. Southern went to Harvard as a lecturer in 1974 and received a dual appointment in Afro-American studies and music in 1976.
While at Harvard, Dr. Richmond was honored to receive a presidential dual appointment as both Surgeon General and Assistant Secretary for Health.
He then took a dual appointment as assistant general counsel for the Congress of Industrial Organizations and the United Steelworkers of America.
Morgan left NASA in 2008 to join Boise State University in Idaho as the distinguished educator in residence, a faculty position created specifically for her that entailed a dual appointment to the colleges of engineering and education.
First vice president of Taepung Group, he has a dual appointment on a government body overseeing economic development.
He's chosen to remain an entrepreneur in academic science, where he has a dual appointment as an assistant professor at Clemson University in South Carolina.
Dual appointments of the kind James Levine enjoys with the Metropolitan Opera and the Munich Philharmonic are routine.
The dual appointments reflect the fact that some journalists, especially at Internet properties, are creeping closer to the business side.
Avila, who has dual appointments at the French National Center for Scientific Research, in Paris, and the Institute for Pure and Applied Mathematics in Rio de Janeiro, first met Mirzakhani in 1995, when as teens they both won gold at the thirty-sixth International Mathematical Olympiad, in Toronto.
Unlike some Chinese scholars popular in the West, he exuded no aroma of privilege: he had no dual appointments at universities abroad, no obvious awareness that he could be the toast of New York or Berlin, no Davos-worthy polish.
She eventually ended up with dual appointments in chemistry and political science.
