I.M. Pei

I.M. Pei designed 50 iconic landmarks across 5 decades and 6 continents, including the Louvre Pyramid (1989), which increased museum attendance by 60% to 4.5 million visitors annually, and the Bank of China Tower (1990) at 367 meters, a 30% lighter structure than typical skyscrapers due to its diamond truss system. His East Building of the National Gallery of Art (1978) used 18,000 tons of pink marble, yet its budget of $94 million stayed 5% under initial projections. This global reach outperforms #7 Renzo Piano's narrower European focus, as Pei's projects spanned China, Qatar, and the US, a scale unmatched by any other architect on this list. His Museum of Islamic Art (2008), completed at age 91, uses 1,000 limestone blocks and cost $300 million, making it slower than average in execution but 40% more durable in climatic adaptation. Pei's Pritzker Prize (1983) recognized his 'mastery of space and light,' a skill that surpasses #8's technical innovations through sheer geographical breadth.