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Christopher Roach 
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Articles:

Building Decision Trees in Python
Python is a good language for machine learning--it's easy to express powerful algorithms maintainably, and it's flexible to experiment with new approaches. Christopher Roach demonstrates the use and implementation of decision trees, a fundamental feature of datamining, that can help you find trends in your data. Feb. 9, 2006

Spymac's Wheel vs. Dot Mac for Easy Web Services
For Mac users who like a convenient package of web services, two major players have emerged -- Apple's .Mac and Spymac's Wheel. Christopher Roach takes both services for a spin and reports on the strengths and weaknesses of each offering. Feb. 8, 2005

An Introduction to RubyCocoa, Part 2
In Part 1 of this two-part series, Christopher Roach provided some background and helped you get started with RubyCocoa programming. In today's conclusion he gets into the actual code ... and if you're following along, you'll end up with a functioning application. Oct. 12, 2004

An Introduction to RubyCocoa, Part 1
RubyCocoa is a framework that provides a bridge between the Ruby programming language and the Cocoa framework. In this tutorial, Christopher Roach shows you how to use this tool by walking you through the steps for creating a simple GUI for the Unix tar program. Oct. 5, 2004

Ruby/Tk Primer, Part 3
In Part 2 of this series, Chris Roach spent some time with the Tk library. Now in this final installment, he pulls together all of the pieces so you can finish your demo application. Jul. 27, 2004

Ruby/Tk Primer, Part 2
In part one of this series, Chris Roach introduced you to programming basics in Ruby, and in the process, created the back end for the GUI we're working on. Here, he spends some time with the Tk library. Jul. 23, 2004

Ruby/Tk Primer: Creating a cron GUI Interface with Ruby/Tk
In this first installment of a three-part series, Chris Roach shows you how to use Ruby and Tk on Mac OS X. This tutorial creates a program that will act as a GUI-based front end to the cron daemon. Jun. 25, 2004