David Walsh is a well-known web developer, blogger, and speaker who has made significant contributions to the web development industry. He is the senior developer at Mozilla and has been working there since 2009. At Mozilla, he is responsible for developing the Firefox DevTools, a set of web development tools for developers.

Apart from his work at Mozilla, David is also a prolific blogger at davidwalsh.name. He regularly writes about web development, programming, and technology-related topics. His blog has been featured on popular websites like Smashing Magazine, CSS-Tricks, and Net Magazine.

David is an expert in web development technologies like HTML, CSS, JavaScript, and PHP. He is also well-versed in various web development frameworks like React, Angular, and Vue. He has been a speaker at several web development conferences like Fluent, Render, and Web Summit.

David is an active member of the web development community and has contributed to several open-source projects like MooTools, which is a popular JavaScript framework. He is also the author of several popular JavaScript plugins like Tipsy and Sly.