Private swim teacher for 6 yr old?

Hi, 

We're looking for a recommendation of a swim teacher who is available to give private lessons to one or two children at a time in the Berkeley area. We've had a hard time making any group swim lesson timing / logistics work and would love to find someone who comes highly recommended who could help our son learn to swim, and work around our schedule. He did group swim lessons last summer, but is basically at square 1. 

Thanks for any advice! 

Jess