Hi Amy,
Even for internal audits and your supplier audits, always seek auditors with credentials and experience. I would be amiss if I did not recommend, at minimum, the ASQ Certified Auditor credential. But I would suggest going beyond a certificate by looking for someone to audit who maintains their certifications with a personnel certification body such as Exemplar Global or IRCA. My personnel certification body of choice is Exemplar Global; a sister organization to ASQ. Certification as an Exemplar Global certified auditor requires ongoing audit training and/or activities to maintain the skills and abilities required for auditing. Whether you are looking for an internal auditor, supplier auditor, or third-party auditor, you cannot go wrong by selecting an Exemplar Global Certified Auditor.
I hope this helps. Please don't hesitate to reach out if you have questions or need assistance.
Best regards,
Don Brecken, ASQ Fellow, Exemplar Global Master Auditor, and Skill Examiner