Since the book was published, I’ve been running a design firm (Think Green Building) with Tim, so my perspective on design has definitely matured. One big change for me has been meeting Jeff Buscher, a mechanical engineer with lots of big hotel designs under his belt who also has a passion for “natural” building and all it represents. Jeff has taught me a lot about energy modeling and the ins and outs of mechanical and renewable energy systems. This has all culminated in our adoption of a rigorous performance standard called Passive House. For more on this standard and other musings on design, go here to read articles I’ve written in the last couple of years related to design.