Ben Weiss is the founder of Ai Squared, a developer of products for the visually impaired and blind, in Manchester, VT.  Since his retirement from the software world, Ben has designed and built 4 timber-frame buildings on his property in Dorset, including a net-zero home.  An avid user of SketchUp, Ben teaches SketchUp for Timber Framing, SketchUp Skill Builder and SketchUp Workflow for Architectural Design - and has a series of SketchUp timber framing videos on YouTube.