Rex Jaeschke
Computer Consultant
I am a consultant, author, and a leader and designer of seminars, specializing in the programming languages C, C++, C#, and Javaâ„¢. I am also involved in a number of U.S. and international standards committees.


To see my personal blog (on which I post a 4-8-page essay each month) click here.


In September 2018, I started revising my introductory and advanced Java seminars to reflect the current release.

In September 2017, I became chair of the Ecma standards committee TC39, which defines the JavaScriptâ„¢ language.

As part of my work for Facebook, I wrote the first formal specification for the PHP language. This spec is available to the public at I also wrote one for Hack, Facebook's strongly typed language that is built on PHP. That spec is available at