"my area of specialization" is correct and usable in written English. You can use it when talking or writing about the particular subject or field you specialize in. For example: "My area of specialization is cultural anthropology.".
So I really don't appreciate the look you gave me when, in response to your question about my area of specialization, I said, "The domestic industries of Brabant during the Middle Ages".
It's not the worst thing to say, "I was laid off, and I needed a job and so I pursued this position, I gave it a shot, but I eventually went back to my area of specialization".
One of my areas of specialization is as a disease ecologist of marine organisms.
My department is small, with 8 full-time faculty members in their own area of specialization.
This element covers the fact that not all health professionals who complete their specialized training start to work in the intended area of specialization.
Over time a group of chemists with specialized research interests become the founding members of an area of specialization.
(NB Reproductive health is a new area of specialization among COs. It is still facing resistance from MOs specialized in obstetrics and gynecology).
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia