Cullen Bash

HP Distinguished Technologist
Director (interim), Sustainable Ecosystems Research Group
Palo Alto, HP Labs


Cullen Bash is an HP Distinguished Technologist and the interim Director of the Sustainable Ecosystems Research Group at HP Labs. In this capacity he leads research focusing on improving the sustainability of IT systems, and leveraging IT to improve the sustainability of adjacent ecosystems.

Bash began his career at Hewlett-Packard after graduating with a Masters in Mechanical Engineering from the University of California, San Diego in 1995.  Early in his career at HP he contributed to the thermal architecture of HP’s high-end PA-RISC and mid-range line of IA-32 servers.

In 1998 he joined HP Labs, the central research organization for the company, where he began investigating the application of alternative thermal architectures for computer systems like liquid cooling, refrigeration and spray cooling.  He developed inkjet assisted spray cooling, a technology that repurposed HP’s expertise in inkjet printing technology to dynamically and precisely provision coolant for high-density microprocessors using inkjet technology. In the 2000s, as server power density was increasing to keep pace with the “dot com” boom, Bash began focusing on energy management in data centers - large warehouses that house tens of thousands of computer servers and consume megawatts of electricity.  His early research in this area resulted in the first-ever application of computational fluid dynamics to optimize the thermodynamic performance of data centers. 

For the past three years, Bash has led a multi-disciplinary research team at HP Labs investigating Sustainable Data Centers.  This project involves integrating the sources that provide energy to a data center (such as the electricity grid or distributed renewables) with the sources that require energy within a data center (including the IT equipment, the cooling equipment, and the power delivery infrastructure).

A prolific inventor, he holds over 100 patents. In addition to his technical accomplishments, Bash enjoys teaching at the undergraduate and graduate level and has been active in creating and teaching new courses as well as industry workshops on relevant topics.

Research interests

Integrated management of IT, Power and Cooling technologies, electronics cooling and thermal management, sustainability.


  • Bash has published more than 100 papers on a wide variety of topics spanning computing, mechanical engineering and thermodynamics.


  • ASME Fellow

Professional Activities

  • Adjunct faculty at San Jose State University


Bash has been granted over 100 U.S. Patents in a variety of subject areas with dozens pending.