"For forty years, Mark Ellison has worked in the most beautiful homes you’ve never seen, specializing in rarefied, lavish, and challenging projects for the most demanding of clients. He built a staircase that the architect Santiago Calatrava called a masterpiece. He constructed the sculpted core of Sky House, which Interior Design named 'Apartment of the Decade.' His building projects have included the homes of David Bowie, Robin Williams, and others...