Roland Carson will be the hardest to dig out, since the only person with that name listed in a Google search so far was a doctor who died a few years ago. He's listed here as the "founder of Illio, Inc" and as a serial entrepreneur, whatever that is. Illio, Inc., is also hard to dig out with a search. You can Google map the listed address, and it'll show you the back of a house on streetview, but that house fronts another residential road, so the address seems to be to a vacant lot opposite side.
Google map up David and Yoram's address, the streetview will take you right up to the driveway of a modest house, single car garage. They and Roland are also listed as officers of Adcquire, Inc., that launched an advertising app/service for mobile users. Apparently the users would grab a product on store shelves, scan the barcode, answer a question, and would be given credits for answering correctly. Vendors would register with the company to have their product listed. It didn't sell, this was 2012, and the app is no longer available on Apple's app store or the Google Play store.