David Quarrie, currently on assignment at CERN, is chief software architect for the ATLAS high-energy physics experiment. The task is to produce and implement the framework or environment in which scientists will write the physics algorithms to do the physics they need to do as part of the ATLAS experiment, an international research program to be carried out at the Large Hadron Collider at CERN in Switzerland beginning in 2005. David directs the development of all the off-line software for reconstruction, simulation, physics analysis, and the final real-time filter for on-line data generation and collection. Trained as a physicist, David earned his Ph.D. from University College London and has been involved in high energy physics computing since 1970. He has worked at Berkeley Lab since 1993.

Craig Tull recently spent a year at CERN in Geneva to serve as a focal point in getting collaborators at CERN and around Europe more closely involved with the development of the ATLAS software framework, led by David Quarrie. Craig worked with these users to help the software project respond to their specific needs, and he also shared information about ongoing software development with other experimental groups at CERN.

Paolo Calafiura is a scientific applications programmer who works on the infrastructure of large high energy and nuclear physics applications. Currently he collaborates on the Atlas experiment at CERN and on CDF at FermiLab. His interests include architectures and frameworks, code generation, data handling, and data models. Before joining NERSC, Paolo was a post-doc at CERN and at the Scuola Normale Superiore of Pisa, where he also graduated in Physics. His home page is http://electra.lbl.gov/paolo.html.

Chris Day works on the Athena Software Framework for the Atlas experiment under construction at CERN in Geneva, Switzerland. His particular interests include software architecture design, data models for HEP events, and interactive interfaces. He is also working to improve the software development process of the group. He received his Ph.D. in HEP from Cornell in 1979 and has been working with object-oriented computer languages for 25 years.

Igor Gaponenko is a computer software engineer currently working on the database software of the BaBar experiment at SLAC. His professional interests include automation of data handling at HEP experiments, distributed software systems, parallel programming, data acquisition, and real-time software. Before starting to work at Berkeley Lab (1998), Igor was responsible for the architecture and core software development of the data acquisition system for the SND (Spherical Neutral Detector) experiment at the VEPP-2M collider located at the Budker Institute of Nuclear Physics in Novosibirsk, Russia. Igor graduated in Physics and Computer Science from Novosibirsk State University in 1989.

Charles Leggett is currently involved in multiple projects on the ATLAS and DØ experiments. His home page is http://annwm.lbl.gov/~leggett/main.shtml.