The phrase "a specialization in" is correct and usable in written English.
It can be used when referring to a specific area of expertise or focus within a broader field of study or profession.
Example: "She has a specialization in environmental science, which allows her to contribute valuable insights to the project."
Alternatives: "an emphasis on" or "a focus in".
She graduated from Brandeis University and received a master's degree in special education with a specialization in early childhood development from New York University.
And Johns Hopkins offers a doctor of public health with a specialization in mental health.
(Last November, the exercise council, which certifies personal trainers, began offering a specialization in functional training).
Dexter Morgan (Michael C Hall) is a serial killer who works in forensics with a specialization in blood splatter for the Miami Metro Police Department.
He graduated from Oberlin College and received a master's degree in computer studies, with a specialization in music, from Northwestern University.
City University's Cass Business School, based in London's financial district, was the first Western institution to offer an M.B.A. with a specialization in Islamic finance.
Malerba received a B.S. in engineering (with a specialization in telecommunications) from the University of Genoa in 1970.
The current crop of students will complete thirty months of training and coursework, and will receive a degree in business management with a specialization in gastronomy.
His practice, originally in general medicine, soon developed into a specialization in internal medicine, with a particular emphasis on cardiovascular diseases.
Although English competition had crippled the Flemish woolen industry, Ghent developed a specialization in luxury fabrics, and Brugge in cloth for everyday use.
She opted for a high school with a specialization in fashion, though this involved five years of rising before dawn and changing buses twice to get there.
