Entrepreneurs in Residence

The Keller Center is delighted to have the following Entrepreneurs in Residence (EIRs):


In 2007, Greg Olsen, a pioneer in the sensors industry and in space travel, was appointed the engineering school's first entrepreneur-in-residence.

"The position gives students and faculty members access to advice and ideas from a highly successful business founder and adds momentum to the growing number of entrepreneurial activities at the school," said H. Vincent Poor, dean of the School of Engineering and Applied Science. Olsen's appointment is with Princeton's Keller Center, in collaboration with the Princeton Institute for the Science and Technology of Materials.

Olsen said that a company he co-founded, Sensors Unlimited, benefited greatly during its early days from collaborations with Princeton's researchers in material science. "Sensors Unlimited got a lot of help from Princeton and there is a nice trade going on already between Princeton and entrepreneurship," Olsen said. "I just want to keep that going."

Sensors Unlimited developed optoelectronic devices such as sensitive near-infrared and shortwave-infrared cameras for NASA and other clients. In 2000, Sensors Unlimited was acquired by Finisar Corporation for approximately $600 million.

In 2005, Olsen went into space as one of the world's first private citizens to become a self-funded astronaut. He traveled on a Russian Soyuz rocket for a 10-day visit to the International Space Station. Since then he has been devoting much of his time exhorting American students to pursue careers in science and engineering. Olsen has hopes of returning to space sometime in the future.


Brian Trelstad is a Partner at Bridges Ventures, a specialist impact investment fund with $750M under management that is raising an SBIC to invest in businesses that operate in or serve underserved communities in the United States.  Previously, Brian was the Chief Investment Officer of Acumen Fund, a social investment fund investing in innovative social enterprises in South Asia and Sub-Saharan Africa.  Prior to Acumen, Brian was a consultant at McKinsey & Company, worked at the Corporation for National Service and was the co-founder of several early stage companies and social enterprises. 

He went to college at Harvard, and graduate school at Stanford and UC-Berkeley. He is a Henry Crown Fellow of the Aspen Institute and a Kauffman Fellow.  Since 2012, Brian has taught a course on social entrepreneurship to graduate students at the Woodrow Wilson School. 

The Keller Center's EIRs are happy to answer questions and provide guidance to student and faculty entrepreneurs.