# Simon Peyton Jones on Haskell and Why Functional Programming Matters

DevFeed: [Simon Peyton Jones on Haskell and Why Functional Programming Matters](<https://devfeed.tech/articles/co-creator-of-haskell-functional-programming-thinking-in-types-useless-languages-simon-jones-18084.md>)

Original publisher: [Read original article](<https://www.developing.dev/p/co-creator-of-haskell-functional>)

Author: Ryan Peterman

Published: 2026-06-08T10:02:31Z

Content type: article

Language: en

Sources: [The Developing Dev](<https://devfeed.tech/sources/the-developing-dev.md>)

Topics: [Functional programming](<https://devfeed.tech/topics/functional-programming.md>), [Haskell](<https://devfeed.tech/topics/haskell.md>), [Programming](<https://devfeed.tech/topics/programming.md>), [Declarative programming](<https://devfeed.tech/topics/declarative-programming.md>), [Programming language](<https://devfeed.tech/topics/programming-language.md>)

Tags: [declarative](<https://devfeed.tech/tags/declarative.md>), [functional-programming](<https://devfeed.tech/tags/functional-programming.md>), [languages](<https://devfeed.tech/tags/languages.md>), [programming](<https://devfeed.tech/tags/programming.md>), [programming-language](<https://devfeed.tech/tags/programming-language.md>), [types](<https://devfeed.tech/tags/types.md>)

## AI overview

An interview with Simon Peyton Jones, co-creator of Haskell, about functional programming, its emphasis on values rather than mutation, and how it differs from imperative programming.

## Source excerpt

Simon Peyton Jones is the co-creator of Haskell (pure functional programming language) and I interviewed him about functional programming, why it matters, and his thoughts on other programming languages.