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Cover image: This research image is a topographical height map of a compound semiconductor material called gallium phosphide (GaP) that is grown on a silicon (Si) microwire array. This semiconductor structure is designed to absorb sunlight and split water to generate solar fuels in a photoelectrochemical cell. Warmer colors represent higher regions of GaP, and cooler colors depict lower regions. The image width is 77 microns, and the rainbow color scale covers 15 microns in height. It was created by graduate student Andrew Leenheer, working with Professor Harry Atwater, as well as postdoctoral scholar Nicholas Strandwitz, working with Professor Nathan Lewis. The image was obtained using a confocal microscope.

The Caltech Division of Engineering and Applied Science consists of seven Departments and is home to more than 75 faculty who form an interconnected web of researchers creating the frontiers of modern science and engineering. Their students and postdoctoral colleagues have access to world-renowned educational resources, as well as unparalleled opportunities for both basic and applied research.

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Message From The Chair

Ares Rosakis

Snap Shots

The Highest Decoration of the French Republic;
Solar Decathlon;
Team Voyager Wins Caltech Space Challenge;

New Faculty

Whos New: New Faculty

EAS Feature

It's About Societal Impact
Engineering and Applied Science at Caltech

Alumni Profile

Arati Prabhakar
Leaving the Conventional Trajectory

Above: Multi-university team working with Rob Summers.

Progress Report

The Next Step
Stimulating Electrode Array Assists Paraplegic Man to Stand and to Move Legs Voluntarily
by Joel W. Burdick

Idea Flow

Creating an Energy Roadmap to Maximize Societal Benefit

Alumni Profile

From Grasshoppers and Mice to Monkeys and His Sister?
What Inspired David W. Thompson to Start a Rocket Company

Research Note

Ruling Out Bad Behavior
Designing Software to Make Extremely Dangerous Consequences Not Just "Unlikely" but "Impossible"

Campus Resource

The Caltech Center for Diversity
Providing a Real Pathway to Membership for Underrepresented Students at Caltech


Trity Pourbahrami

Design & Photography

Vicki Chiu


Leona Kershaw
Tina Rutch

Copy Editors

Sara Arnold
Kathleen Hand

Contributing Writers

Julian Camillieri
Eric Iberri

Special Thanks

Marcia Brown
Kathy Svitil

Image Credits

pg. 4: Research images—Courtesy of Ares Rosakis; F-22 Raptor, 2009—U.S. Navy/Petty Officer 1st Class Ronald Dejarnet
pgs. 5, 9 (Minnich), 33: Briana Ticehurst
pgs. 6 (Elachi), 13 (Hassibi): Bill Youngblood
pg. 6: Solar Decathlon—Stefano Paltera/U.S. Dept. of Energy
pg. 7: Space Challenge—Courtesy of Keck Institute for Space Studies
pg. 8: Inhwa Choo
pg. 9 (Kochmann): Lance Hayashida
pg. 17: Bob Paz
pg. 18: Patrick Windham
pg. 20: Implanted electrode array—The Lancet; Electrical leads implanted in the paraplegic patient—Medtronic, Inc.
pg. 22: University of Louisville
pg. 28: Dawn—Courtesy of JPL/NASA, McREL; Ceres—Courtesy of JPL/NASA, Hubble telescope
pgs. 28–29: Cygnus and Taurus II—Courtesy of Orbital Sciences Corporation
pg. 30: MGS—Courtesy of JPL/NASA, Corby Waste
Inside Back Cover: John Friedman Alice Kimm Architects