Christopher Alexander (1936–2022) was an Austrian-born British-American architect, design theorist, and influential thinker whose work reshaped architecture, urban planning, and even software development. Best known for his seminal books A Pattern Language and The Timeless Way of Building, he championed human-centered design that emphasized harmony, livability, and organic growth in built environments. With degrees from Cambridge and Harvard, he later taught at UC Berkeley, inspiring generations of architects and designers. Over his career, he designed more than 200 buildings worldwide and played a key role in the New Urbanism movement, leaving a lasting impact on design philosophy and practice.