• Second technical employee of a small consulting start-up that focuses on creating advanced scientific applications using Python. Hired the day following the initial interview after the founding partners had already reviewed over 400 applicants.


• Created several open source Python projects which are now the foundation for all applications produced by Enthought:
  • Traits: A powerful reactive programming and user interface package.
  • Chaco: A 2D plotting package oriented toward scientists and engineers.
  • Enable: A 2D graphics component model and library.


• Worked on the development of:
  • Two seismic and geophysical simulation applications (ProAVA2 and Converge).
  • A computational fluid dynamics modeling/simulation application (VMS).
  • A ground penetrating radar simulation system (Tempo).

• Responsible for the design and implementation of a secure, cross-platform mobile agent system for agent-based network intrusion detection, auditing and forensic information gathering.


• Responsible for the complete design, implementation and testing of a browser-based user interface to a cross-platform intrusion detection security system.

• Designed and implemented Jester, an introspection based test tool for Enterprise Java Beans.
• Created sample Java Servlet and JSP (Java Server Pages) based Enterprise Java Bean applications for Websphere Application Server.
• Designed and implemented major portions of a Java Bean component assembly tool and a distributed catalog for Java Bean components.
• Technical lead for the SOM kernel, IBM's cross-platform, language neutral system object model.
• Developed Avid compatible video import function for broadcast quality non-linear video editing system on IBM PVS supercomputer.
• Created/developed DrDialog, a Visual Basic-like programming environment for OS/2 REXX.
• Created/developed HOPE, an Oberon language programming environment for OS/2.
• Created/developed ME/2, an OS/2 environment for building programming environments.
• Created/developed WINK and EGAD, fast windowing libraries for PC DOS.
• Created/developed DCEMM, an EMM (Extended Memory Manager) emulator for PC DOS.
• Created/developed QikCache, a disk caching program for PC DOS.
• Co-created/developed ACE, a C programming environment for PC DOS.
• Lead team that developed TopView, a window-based, multi-tasking extension to PC DOS.
• Worked in advanced office systems technology group. Created/developed prototypes of object-oriented, window-based systems for System/370 VM, Apple II and original IBM PC.
• Lead team that developed System/34 BASIC language product.
• Lead team that developed System/34 MRJE remote job entry product.
• Lead team that developed System/32 1255 MICR (check reader) attachment product.

Traits, Chaco, Enable, et al

At Enthought, created many of the open source Python projects which are now critical components of the company’s software infrastructure:

• Traits: A type and user interface package. Quoting the Enthought web site: “Traits are a "big deal." The traits package is at the center of all development we do at Enthought and has changed the mental model we use for programming in the already-extremely-efficient Python programming language.”


• Chaco: A 2D plotting package oriented toward scientists and engineers.


• Enable: A 2D graphics component model and library.


• DockWindows: A wxPython-based window docking component used extensively by both the Traits UI package and the open source Envisage Workbench plugin.


• Features: A unique, extensible, metadata and event driven extension to DockWindows that allows visual components and tools to be dynamically configured to create new tools by the end user with no programming involved.

PyCon and SciPy Presentations

While at Enthought, gave several presentations on Traits, DockWindows, Features and Chaco at various PyCon and SciPy Python conferences.

Mobile Agent System

• Security audits
• Intrusion detection
• Forensic evidence gathering.

The design was based on digitally signed agents sent over encrypted network connections along with tamper-resistant data gathered at the various systems visited by an agent on its itinerary.

One of the more interesting aspects of the system design was its inclusion of smart proxies for agents. The initial design included support for more than a half-dozen types of smart proxies, which transparently supplied the agent developer with different kinds of quality of service and network management capabilities.

For example, one type of smart proxy provided automatic load-balancing capabilities to its clients, while another type provided automatic fail-over to clients in the event of an agent system crash or failure. The type of proxy used with a particular agent was a design decision made by the agent developer based on the characteristics and intended use of the agent.

dtrace

A secondary result of the mobile agent development was the creation of dtrace, a dynamic trace tool useful for monitoring and probing the behavior of long-running server type applications, such as the mobile agent execution environment.

The dtrace tool allowed the developer to interactively and selectively trace control flow and dynamically monitor objects within the server while it was running, with minimal performance impact. Complete tracing profile configurations could be easily saved and loaded without stopping and restarting the server, thus allowing the developer to quickly reconfigure the tool as needed.

ZopeWatch and DGen

The system is completely database driven and consists of 360+ web pages and database back-end processing pages, containing more than 87,000 lines of DTML (an HTML extension language) and SQL (nearly 5 MB of source code).

The system, based on Zope (an Open Source web application server using a powerful OO database) and the MySQL database, was developed in the following stages:

• Created a tool (ZopeWatch) which enables standard tools like CVS, EMACS, Fireworks and Dreamweaver to seamlessly integrate with the Zope OO database running across a network using an XML-RPC interface.

• Created a UI "scripting language" (DGen) which allows a developer to describe a database driven web page in terms of SQL queries, updates, fields and high-level presentation styles (e.g. Report, Update, View, Query, and so on). The script interpreter then automatically generates all necessary HTML, DTML, Javascript, and server-side SQL processing code needed to implement each web page. The generated pages are then transparently uploaded to the Zope server using ZopeWatch. The generated pages also have the side benefit of allowing each user to modify the page's appearance through fully customizable "themes".

• Defined a security system database schema that models the capabilities of each component in the intrusion detection system, and used the UI scripting language to implement a user interface that allows each security expert to fully describe his or her components.

• Created higher-level scripts which extract "meta-data" from the security database and automatically build and run the DGen UI scripts needed to create the web pages that allow end users to configure the intrusion detection system.

• Used DGen to create all remaining web pages for the system (e.g. intrusion detection reports, new user registration, etc).

Jester

Conceived, designed and implemented Jester, an introspection based Java test tool that allows developers to interactively "unit test" Java classes without having to write Java test cases.

Results can be saved as "scripts" which can be combined and played back in later sessions for regression testing or test environment setup.

DrDialog

Conceived, designed and developed DrDialog, a "Visual REXX" programming environment that allows programmers to quickly and easily build GUI-based OS/2 applications using REXX.

DrDialog was used by thousands of programmers within IBM, including the team that built the broadcaster support system used at both the Atlanta and Nagano Olympics.

DrDialog was also made available to IBM customers as part of the OS/2 Developer Connection and the OS/2 Warp operating system product (Japanese version).

HOPE

Conceived, designed and developed HOPE, an Oberon language based programming environment.

Oberon is the successor to Modula-2 developed by Niklaus Wirth, and is a simple, high-level object oriented language comparable in many ways to Java. HOPE embodied many advanced programming tools and concepts, including:

• A fast compiler engine capable of generating 16 and 32-bit code for DOS, Windows and OS/2
• Automatic module import
• Automatic dependency management (i.e. automatic "make")
• Automatic structural and control flow graphing, source and object hierarchy browsers
• Cross project symbol usage and definition tools
• A virtual memory based persistent object storage system.

GLUE

Conceived, designed and developed GLUE, a fast, powerful, high-level, object oriented cross-platform scripting language that preceded Python and Java by several years.

ME/2

Conceived, designed and implemented ME/2, a meta-programming environment for developing programming environments.

Developed in 1987, ME/2 was based on the use of software components and a high-level scripting language (GLUE). These same notions were two of the cornerstones of Microsoft's software strategy in the 90's (i.e. components and scripting).

TopView

Conceived, designed and lead the team that implemented TopView, IBM's first multi-tasking, window based, object oriented operating system for the PC.

The release of TopView was a major event in the early history of the PC, preceding Microsoft Windows by a significant margin. The October 26, 1998 issue of Info World cited TopView as one of computing's milestones in their 20th anniversary issue look back at the computing industry.