Agreed, David has been a powerful creative force in the world of high end audio (and beyond). The ZOTL circuit coupled with his proprietary power supply topology are what make his amps and those produced by LTA among the best available at any price.
@clio09 What you may be missing is the role that Mark has played in bringing David’s technology to a wider audience. His gifting is in product design and manufacturing. As is often the case with brilliant thinkers like David, his capacity and interest in scaling production while maintaining reliability was somewhat limited and this is where his partnership with Mark has paid dividends for audiophiles who want world class sound and dependable gear at sane prices. Without Mark’s talents only the ultra rich would be able to enjoy the benefits of David’s designs.