I recently had people coming to me asking me what is the process to verify a particular certification and if I knew of a centralised way for doing this.
Unfortunately (or fortunately as some may say) there isn't a centralised way where you could query for a particular certification.
For example, the PCI Security Standards Council (PCI SSC) maintain a list of all certified companies and Qualified Security Assessors which is constantly up-to-date. If you want to verify a consultant's certification the only thing you need to do is to visit this link.
Anyhow, this blog post is intended as a reference guide to the various webpages where you can verify a particular certification. If you do know of any other or you found that the list needs to be be updated just send me a message on Twitter and I will update it as soon as possible.
Below, the certifications are listed Alphabetically according to the respective company which have issued each certificate.