Collocations for consultant - noun

business, campaign (esp. AmE), computer, design, educational, financial, industry, management, marketing, media, political, public relations (abbreviated to PR), security, technical, technology
independent, outside
The review was carried out last year by independent consultants.

senior

act as
He was happy to act as a consultant to the company.

bring in, employ (sb as), engage (sb as) (esp. BrE), hire (sb as), use
We brought in a management consultant to sort out the mess.

consultant in
a consultant in design, printing and advertising

consultant on
a consultant on business ethics

consultant to, consultant with
They work as consultants to a software company.

hospital, NHS
She is now a hospital consultant.

cardiologist, gynaecologist, obstetrician, paediatrician, pathologist, physician, psychiatrist, surgeon, etc.

consultant in
a consultant in psychiatry