Anders Hejlsberg

Danish software engineer who co-designed several popular and commercially successful programming languages and development tools. He was the original author of Turbo Pascal, the chief architect of Delphi, and worked for Microsoft as the lead architect of the C# programming language.

Hejlsberg was born in Copenhagen, Denmark, and studied engineering at the Technical University of Denmark. While still a student, he began writing software tools that would later define his career. He developed the first version of Turbo Pascal, which Borland acquired and sold starting in 1983. His compiler design was remarkable for its speed and compact size, fitting entirely in memory at a time when most compilers required disk swapping.

After joining Borland full-time, Hejlsberg served as the chief architect of Delphi, a rapid application development environment built around Object Pascal. Delphi became widely adopted in the software industry during the 1990s and was considered a landmark product in visual component-based development. His work on Delphi demonstrated his ability to design tools that balanced power with accessibility for working developers.

In 1996, Microsoft recruited Hejlsberg, where he initially led the development of the Visual J++ language and the Windows Foundation Classes. He subsequently became lead architect of C#, a language he designed from the ground up as part of the .NET initiative. C# went on to become one of the most widely used programming languages in the world.

Hejlsberg also led the design of TypeScript, a statically typed superset of JavaScript that Microsoft released in 2012. TypeScript addressed scaling challenges that developers faced when building large JavaScript applications. His contributions across multiple decades established him as one of the most influential language designers in the history of commercial software engineering.