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Jonathan Abrams
Age: 34
Founder and chairman, Friendster
Created the Net’s top social-networking site, where eight million people communicate with friends and friends of friends. The Mountain View, CA, firm has raised $14 million in venture capital.

Guido Appenzeller
Age: 33
Founder and chief technology officer, Voltage Security
Started a Palo Alto, CA, firm to commercialize an encryption technology that uses a simple ID, such as an e-mail address, to ensure secure communications.

Alyssa Apsel
Age: 31
Assistant professor, Cornell University
Adapts optical-communications technology to build receivers, transmitters, and interconnects that speed chip-to-chip communications within computers.

Anuj Batra
Age: 34
Systems engineer, Texas Instruments
Leads one of the industry’s top teams advancing ultrawideband wireless technology, which provides the high transmission speeds needed for streaming-media applications while consuming little power.

Serge Belongie
Age: 30
Assistant professor,University of California, San Diego
Created video software to analyze lab mice for adverse reactions to trial drugs. The system is related to fingerprint-matching technology he and Vance Bjorn (see below) founded DigitalPersona to commercialize.

Vance Bjorn
Age: 31
Chief technology officer and cofounder, DigitalPersona
Partnered with fellow TR100 honoree Serge Belongie (see above) to found a Redwood City, CA, biometrics company that specializes in fingerprint recog-nition for computer access.

J. J. Cadiz
Age: 29
Program manager, Microsoft
Invented a better approach to alleviating information overload, using a sidebar window on computer displays to track e-mail alerts, weather reports, and other data. Look for Sideshow in future versions of Windows.

Tianqaio Chen
Age: 31
CEO and cofounder, Shanda Interactive Entertainment
Built his Shanghai startup into China’s largest online game company by specializing in multiplayer fantasy and role-playing games that now attract millions of users. Shanda’s IPO last May raised $152 million.

Aref Chowdhury
Age: 32
Member of technical staff, Lucent Technologies
Invented techniques at Bell Labs that enable higher-speed transmission of data over very long distances (up to 6,400 kilometers) within fiber-optic networks.

Raffaele Colombelli
Age: 33
Research staff member, University of Paris-Sud
Develops new types of quantum cascade microlasers with a variety of sensing and imaging applications.

Adrian Colyer
Age: 33
Senior technical-staff member, IBM
Leads IBM’s Winchester, England-based effort to improve software quality and cut development costs through “aspect-oriented programming,” an approach that promises to simplify coding for a wide range of applications.

Robert Drost
Age: 34
Principal investigator, Sun Microsystems
Pioneered a wireless technology to eliminate the wired connections between closely spaced chips in computer systems. The advance, enabling a 100-fold speed gain over wired connectors, will be crucial to future Sun supercomputers.

Dan Gruhl
Age: 32
Research staff member, IBM
Serves as chief architect for IBM’s WebFountain system, which identifies patterns in and extracts meaning from billions of Web pages to aid business decisions and fraud detection.

Michael Helmbrecht
Age: 34
Founder and CEO, Iris AO
Fabricates microscopic, deformable mirrors on computer chips that perform image correction for medical imaging, surveillance, and other applications.

Aaron Hertzmann
Age: 30
Assistant professor, University of Toronto
Combines machine learning and graphics to capture the motion of actors, dancers, and athletes – and to generate realistic animations for films and video games.

Kurt Huang
Age: 34
Cofounder and president, BitPass
Launched a startup developing micropayments technology that allows artists, small businesses, and others to charge fees of as little as one cent for access to online content.

Ari Juels
Age: 34
Principal research scientist, RSA Security
Devised techniques at Bedford, MA, firm to improve the security and privacy of radio frequency identification tags, as well as cryptographic tools for authentication systems based on personal information and biometrics.

Richard Kent
Age: 34
Assistant professor, University of Virginia
Produces biomechanical data vital to the design of air bags and auto safety systems that adjust during a crash, customizing protection to such factors as the passengers’ size, weight, and physical condition.

Andre Kulzer
Age: 29
Research engineer, Bosch
Created a thermodynamic simulation that showed the feasibility of gasoline direct injection, which lowers auto fuel consumption and emissions and eliminates the electric starter.

Golan Levin
Age: 32
Assistant professor, Carnegie Mellon University
Explores the artistic implications of information technology. For Dialtones: A Telesymphony, the artist and engineer choreographed the ringing of audience cell phones.

Massimo Marchiori
Age: 34
Professor, University of Venice
Develops more efficient ways of identifying, finding, and retrieving information on the Web. The computer scientist also developed the World Wide Web Consortium’s Internet privacy standards.

Wojciech Matusik
Age: 31
Visiting research scientist, Mitsubishi Electric
Uses sophisticated computer graphics and image-rendering techniques at Mitsubishi Electric’s Cambridge, MA, lab to create 3-D television and related 3-D photo and video systems that weave together images from multiple cameras.

James O’Brien
Age: 34
Assistant professor, University of California, Berkeley
Invented algorithms for simulating natural phenomena such as splashing water and explosions, for use in movies, video games, and advanced training simulations.

Nuria Oliver
Age: 33
Researcher, Microsoft
Constructs more-intuitive human-computer interfaces. The Spanish native’s projects include a smart office that can recognize what its occupants are doing and a system that lets users interact with computers via hand gestures.

Ramesh Raskar
Age: 34
Visiting research scientist, Mitsubishi Electric
Built large computer display systems that seamlessly combine images from multiple projectors. The computer scientist’s image-processing and graphics research may lead to new applications in entertain-ment, image-guided surgery, and user interfaces.

Jennifer Rexford
Age: 34
Senior technical consultant, AT&T
Created tools for monitoring and automatically managing Internet traffic on large networks. The computer scientist’s innovations are used in several systems, including AT&T’s commercial backbone network.

Sokwoo Rhee
Age: 34
Founder and chief technology officer, Millennial Net
Designed extremely-low-power wireless-sensor networks at Burlington, MA, startup. The company’s dime-sized sensor nodes can be used for environmental monitoring, surveillance, and health-care applications where inexpensive, long-term data collection and control are key.

Shad Roundy
Age: 33
Lecturer, Australian National University
Built tiny generators for wireless sensor networks that convert low-level background vibrations into electricity, eliminating the need for batteries.

Jesse Schell
Age: 34
Professor, Carnegie Mellon University
Invents new forms of digital visualization. The professor of entertainment technology teaches game design and heads simulation projects, including one that helps firefighters deal with terrorism.

Kees Schep
Age: 34
Department head, Philips Electronics
Helped develop blue-laser optical-disc storage systems with much greater capacity than today’s DVDs. The discs are now being introduced commercially.

Chaitali Sengupta
Age: 34
Systems architect, Texas Instruments
Oversees the architecture of the communications chips used in advanced cellular systems now coming to market. The chips let multimedia cell phones more easily handle Internet access, videoconferencing, and mobile commerce.

Pierre Sillard
Age: 34
R&D project manager, Alcatel
Devised a software modeling tool that enabled him to design complex optical fibers now being manufactured for use in very-high-capacity communications systems.

Simeon Simeonov
Age: 31
Principal, Polaris Venture Partners
Left software engineering to engineer startups. The venture capitalist advises Archivas, which uses distributed computing to manage digital archives, and Service Integrity, a Web services firm.

Charlotte Skourup
Age: 34
Senior principal scientist, ABB
Employed “augmented reality” technologies – such as goggles that overlay the visual field with computer graphics – to help human operators program robots for industrial painting and other manufacturing tasks.

Ben Trott
Age: 27
Cofounder and chief technology officer, Six Apart
Teamed with wife Mena (see profile, this page) to found the San Mateo, CA-based company that developed Movable Type, a popular and easy-to-use program for creating weblogs, and TypePad, a service that publishes them.

Srinidhi Varadarajan
Age: 31
Director, Terascale Computing Facility, Virginia Polytechnic Institute and State University
Conceived and built the world’s third-fastest supercomputer from a cluster of 1,100 Apple Macintoshes for $5 million. Other world-class supercomputers, in government, universities, and industry, cost $100 million or more.

Min Wu
Age: 29
Assistant professor, University of Maryland
Devised ways to hide digital watermarks in financial statements and other electronic documents to authenticate records, prevent fraud, and deter unauthorized distribution.

Qian Zhang
Age: 31
Researcher, Microsoft
Improved roaming between cellular networks and created better compression and delivery technologies for wireless multimedia. Based in Microsoft’s Beijing research lab, she has more than 20 patents pending.

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