"professional firms" is a correct and usable phrase in written English.
For example, "The economy in our city has been buoyed by the success of professional firms in recent years."
We argue that professional firms are increasingly important in professionalization and regulatory processes and have not received the attention that they warrant: an examination of the multi-national professional service firms (currently known as the Big 4) can enhance an understanding of professionalization and professional regulation.
Several professional firms also provide security for hotels and other businesses.
KPMG is a global network of professional firms providing audit, tax and advisory services.
Just what role outside professional firms played in the genesis of the financial crisis has not been adequately explored.
As a result some landlords trying to evict tenants turn to professional firms to manage the process.
Second, the professional firms creating and selling these arrangements clearly think they benefit from the considerable fees involved.
Then he had considered it a "family-run professional firm".
The company retained a professional firm to clean out the system and relied upon the expertise of that company".
McKinsey owes its longevity to one man, Marvin Bower, and his vision of McKinsey as a professional firm, as respectable as a law firm or an investment bank.
The government's conviction of Andersen, a partnership like many law firms, ended the idea that a successful professional firm could weather any crisis.
You can switch jobs, obtain graduate degrees or simply work more as an independent contractor or partner in a professional firm.
