
"David is one of my most reliable sources for what works in the AdWords trenches" Howie Jacobson PhD
'AdWords For Dummies'
"when I said we already do AdWords Marketing for more than a year most managers backed off" - Integra Global Solutions
"very knowledgeable and passionate, compelling presentation and we engaged him on the spot" - Perforce Software
"...going absolutely great, and you are doing an amazing job" - Hilti



"David is the only ‘insider’ resource on the ins and outs of Google's Conversion Optimizer that we know of.
At Perry Marshall and Associates we intend
to make full use of his expertise on this."
Perry Marshall & Bryan Todd
'The Ultimate Guide to Google AdWords'