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Mary Lou Jepsen (born 1965) is Head of the Display Division at Google X Lab. She is also founder of Pixel Qi, a manufacturer of low-cost, low-power LCD screens for laptops. She was the co-founder and the first chief technology officer of One Laptop per Child (OLPC).
Jepsen studied Studio Art and Electrical Engineering at Brown. She received a Master of Science in Holography from the MIT Media Lab, and then returned to Brown to receive a Ph.D. in Optical Sciences. Her contributions have had worldwide adoption in head-mounted display, HDTV and projector products. Her PhD work combined rigorous theoretical coupled-wave analysis with lab work, in which she created large-scale, embossed surface-relief diffraction gratings with liquid crystal-filled grooves with high diffraction efficiency in un-polarized illumination.
Jepsen has created some of the largest ambient displays ever. In Cologne, Germany she built a holographic replica of pre-existing buildings in the city's historic district...and created a holographic display encompassing a city block. She also conceived, built mathematical models of, resolved the fundamental engineering issues, and solved some of the logistics - to create what would have been the largest display ever for mankind: images displayed on the darkened moon. She co-created the first holographic video system in the world at the MIT Media Lab in 1989, where the interference structure of the hologram was computed at video rates, and shown on her hand-made display. This system inspired a new subfield of holographic video and received numerous awards.
Jepsen helped pioneer single-panel field sequential projection display systems, co-founding Microdisplay, the first company whose sole effort was the development of tiny displays, in 1995. There she served as its chief technology officer through 2003. 
In 2005 Jepsen joined the faculty of the MIT Media Lab as a professor with a tenure-track position. Here she started the Nomadic Displays Group. However, she became increasingly convinced that she could have more impact by fully concentrating on One Laptop per Child and took a multi-year leave of absence. Then, hooked on the impact that OLPC was having using the massive factory infrastructure of the world, she made the difficult choice to not return to be an MIT professor and instead moved to Asia. 
In January 2005, Jepsen joined Nicholas Negroponte to start One Laptop per Child and lead the design, partnering, development and manufacture of the $100 laptop. As of 2013, a few billion US dollars has been spent on this program globally. Every child in Uruguay has an OLPC laptop. There are deployments in over 50 other countries and in more than 25 different languages. OLPC is credited with changing the equation for what a minister of education can do to improve the education of a country's children.  
For the entire first year of the effort (2005) she was the only employee of One Laptop per Child [OLPC]. By the end of 2005, she had completed the initial architecture, led the development of the first prototype (which UN Secretary General Kofi Annan unveiled at a UN summit), and signed up some of the world's largest manufacturers to produce the XO-1. By the end of 2007 she had led the laptop through development and into high volume mass production.
At OLPC, notably, Jepsen invented the laptop's sunlight-readable display technology and co-invented its ultra-low power management system - and - has transformed these inventions into high volume mass production rapidly. The XO laptop is the lowest-power laptop ever made, and the most environmentally friendly laptop ever made. The laptop can sustain 5 foot drops, is mesh networked extending the reach of the network by letting signals hop from laptop to laptop.
After 3 full years with OLPC, In early 2008 she left OLPC to start a for-profit company, Pixel Qi, to commercialize some of the technologies she invented at OLPC.  Pixel Qi's business is based on the concept that the screen is the most critical component of any mobile device. Pixel Qi screens are available in a few dozen products and massively reduce the power consumption of the screen, which now accounts for about 90% of the power draw in an Apple iPad, and 70% of the power draw on a standard cell phone. 
Mary Lou Jepsen was one of the first contributors in Google's "Solve for X"  projects with her idea of "Imaging the Mind's Eye".
Mary Lou has won several major awards:
She has also received numerous awards for the work she did at One Laptop per Child, and has been named to many other "top" lists in computing by Fast Company, New York Times, IEEE Spectrum and others. She is the "foursquare" mayor of Carnegie's Restaurant and Bar in Taipei, Taiwan. Quoted as saying "I honestly come here just for the food". 
Jepsen is married to John Patrick Conor Ryan, formerly a partner at Monitor Group. In 1995, she suffered from a pituitary gland tumor and had it removed and thus suffers from panhypopituitarism, requiring a twice-daily regimen of hormone replacement.
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