William Adam was a prominent Scottish architect and builder in the 18th century, known for his significant contributions to the neoclassical architectural style. He was born in 1689 and became famous for his innovative designs and the use of decorative elements in his buildings. His work often emphasized symmetry and proportion, which were key characteristics of the neoclassical movement. Adam was also part of the Adam family, a dynasty of architects that included his sons, who continued his legacy. Some of his notable projects include the Register House in Edinburgh and various country houses across Scotland, showcasing his influence on Scottish architecture.