Yes, to some degree a certificate verifies that someone has at least a general knowledge of SEO. No, having a certificate does not insure that an individual is more qualified then another non-certified SEO guy.

Yes, to some degree a certificate verifies that someone has at least a general knowledge of SEO. No, having a certificate does not insure that an individual is more qualified then another non-certified SEO guy. The only credible measurement of an SEO’s ability is their portfolio.

Excerpt from:
SEO Certified – What does it mean?