I work for a small website dev company in California and we have a new client who manages their own Google PPC campaigns, that is they did until some recent changes in the program that has caused them to see some significant changes in their paid rankings and their costs. We pretty much only deal with basic organic SEO and have very little experience on the PPC side (enough to know what we don't know!) and are looking to bring in someone to assist our client with their campaign.
This isn't a solicitation for help, my question is how to pick a person/company to to help them out. How do I tell who is actually qualified and who is trying to blow smoke up my @#$? We are working on redesigning the website (adding more content and improving navigational structure) and don't want to bring in a person/company that will A) Not be able to help the client with his issues. B) make us look bad C) Steal the client.