The phrase "a third party professional" is correct and usable in written English.
It can be used when referring to a professional who is not directly involved in a transaction or agreement but provides services or expertise to one of the parties involved.
Example: "To ensure an unbiased evaluation, we decided to hire a third party professional to assess the project's progress."
Alternatives: "an external expert" or "a neutral consultant".
None of those accusations can be used to criticise this new study, Professor Lewandowsky says, because the questionnaire was carried out by a third-party professional survey company using a sample that was representative of the US population.
The second dimension they looked at was "warranting" -- basically, backing up any written claims by including some kind of evidence, such as detailed personal information that could be verified online, or links to a third-party professional site that could verify their biography.
To some cloud users, a cloud auditor as a third-party professional organization may be a satisfactory trust root.
Interviews were recorded and transcribed by a third-party, professional transcription service.
Suggestions included posting information on a third-party professional education website, sending email updates, or holding follow-up seminars.
Students may also submit other documentation that supports their appeal from medical professionals, counselors, or other third party professionals (non-family members) who understand the details of the situation.
Each acts as a third party to match professional skills with community groups.
In a dataset the manipulation has been done by a third party, often a professional organization, and outcomes of these investigations can be inspected by the students.
I would like to bring in a third party, someone impartial, for a professional opinion.
We carefully selected exercise referral scheme studies on the basis that there was a clear statement of referral of participants by a primary care health professional to a third party exercise provider.
5 Schemes generally consist of a referral by a primary care health professional to a third party (usually a leisure facility), followed by a series of consultations with an exercise specialist, and a programme of supervised physical activity over a 10-week to 12-week period.
