Hey Anders,
I always ask myself the question "Is this link useful for users?".
If someone will be reading those pages and will come across the areas of expertise - they will likely want to find out more about them, especially if they're unsure of what they are.
My vote is to add the links in - it creates an association between these pages and benefits users looking to find out more about the services the staff specialise in.
Cheers,
Sean