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Now Available: Innovators Under 35 2013 See The 2013 List »

Partha Ranganathan, 34

Power-aware computing systems

Hewlett-Packard Labs

Every year, computing devices--from cell phones to servers--consume at least 125 terawatt-hours of electricity, roughly the amount produced by burning 350 million tons of coal. Partha Ranganathan, principal research scientist at Hewlett-Packard Labs, is developing strategies to bring that figure down (see below). "All the ideas are very intuitive," he says. "But we needed to solve some hard problems to get there." Technologies he helped develop, which could save money and lower greenhouse-gas emissions, are already starting to appear in consumer and business products.

Chart by Alastair Halliday

Taking a bite out of the energy pie:
Estimated savings, as a percentage of power used globally by computing devices (assuming widespread adoption of these strategies). Scroll over the pie chart for a description of each part.

--David Talbot

2007 TR35 Winners

Sanjit Biswas

Cheap, easy Internet access

Josh Bongard

Adaptive robots

Garrett Camp

Discovering more of the Web

Mung Chiang

Optimizing networks

Tadayoshi Kohno

Securing systems cryptographically

Tariq Krim

Building a personal, dynamic Web page

Ivan Krstic´

Making antivirus software obsolete

Jeff LaPorte

Internet-based calling from mobile phones

Karen Liu

Bringing body language to computer-animated characters

Anna Lysyanskaya

Securing online privacy

Tapan Parikh

Simple, powerful mobile tools for developing economies

Babak Parviz

Self-assembling micromachines

Partha Ranganathan

Power-aware computing systems

Kevin Rose

Online social bookmarking

Marc Sciamanna

Controlling chaos in telecom lasers

Desney Tan

Teaching computers to read minds

Luis von Ahn

Using “captchas” to digitize books


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