much better to make sure you have either verifiable employment info and / or direct provider references and / or date-check, preferred411, roomservice2000 verified membership

To be sure he is a TER member per se have him PM you on the site.

But be aware - anyone and I mean anyone can sign up for a TER membership, including LE!

If he isn't white listed, and doesnt have enough revews of other providers to make you comfortable. Then you have 2 safe choices, either find another mutually acceptable method of verification/screening , or dont accept an appointment with the gentleman