The People Behind JANYS

The Team

Picture of JP Onnela

(JP) Onnela


Jukka-Pekka "JP" Onnela is a co-founder and a Senior Data Scientist at Janys. He is an Assistant Professor of Biostatistics at Harvard University, and his interests cover a broad range of theoretical and applied problems in network science. He has published extensively in this area in journals like Proceedings of the National Academy of Sciences USA, Science, and the Journal of the American Medical Association.

Picture of Alan Mislove



Alan Mislove is an Assistant Professor at the College of Computer and Information Science at Northeastern University. He received his Ph.D. from Rice University in 2009, and was a postdoctoral researcher at the Max Planck Institute for Software Systems (MPI-SWS) in the summer of 2009. Prof. Mislove’s research concerns distributed systems and networks, with a focus on using social networks to solve systems problems. In particular, his research is focused on studying computer systems that enable communication among people, such as online social networks, and designing, building, deploying, and evaluating innovative systems of this kind. He is a recipient of the prestigious NSF Career Award (2011), and his work has been covered by New Scientist, the New York Times, and the CBS Evening News.

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Co-founder & CEO

(James) Niels Rosenquist is a co-founder and the CEO of Janys. A trained economist and psychiatrist with appointments at Massachusetts General Hospital and Harvard Medical School, he has published a number of papers in realms as diverse as genetics, social networks, applied economic theory, and social media. A graduate of the University of Michigan (B.S.), The University of Pennsylvania (M.D.) and the Wharton School (Ph.D.), Niels lives with his wife and infant son in Cambridge Massachusetts.

Picture of Yong-Yeol Ahn



YY Ahn is a co-founder of Janys and an Assistant Professor at Indiana University Bloomington. He was born and studied in South Korea and moved to US in 2008. What fascinate him most are various complex systems across domains, such as society and living organisms. He is particularly interested in data-driven science of networks and complex systems.

Picture of Sune Lehmann



Sune Lehmann is an Associate Professor at DTU Informatics, Technical University of Denmark. He began his career as a physicist, but his interests have shifted towards complex networks and massive datasets, working in the intersection between physics, sociology, and computer science. Sune's work focuses on understanding the structural and dynamical aspects of complex network topology, as seen from a statistical standpoint, and he's currently working to understand how the temporal dynamics of network edges influence the modular structure found in many social networks.

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Steven Lehrer is an Associate Professor of Economics at Queen’s University and a faculty research fellow at the National Bureau of Economic Research (NBER). His research focuses on using empirical methods to address topics in the health economics, economics of education and experimental economics literature. In addition, he has worked on a number of methodological projects that provide new methods to estimate causal effects as well as discuss how to properly incorporate information collected in large datasets (including those collected from social media websites) in social science analysis. His research has been published in the Review of Economics and Statistics, Review of Economic Studies, American Political Science Review among other outlets. His recent research evaluating universal childcare policies was awarded the 2013 John Vandekamp prize for best article in Canadian Public Policy and his work on genetic lotteries received the 2009 Victor R. Fuchs Research Award for his best paper with the potential to spawn new research in an underdeveloped area of health economics or health policy Prior to joining Queen’s, Prof. Lehrer spent two years at the Wharton School, University of Pennsylvania as the John M. Olin Postdoctoral Fellow in Medical Economics. He received his PhD in economics from the University of Pittsburgh and his B. A. in Economics at McGill University. He also serves as an associate editor for the Journal of the Royal Statistical Society, Canadian Public Policy and Empirical Economics.

Picture of Daniel Bergstresser


Chief Operating Officer

Sarah Kent joined Janys Analytics as Chief Operating Officer in June 2013. A practicing physician and applied economist, she holds appointments at Brigham and Women's Hospital/Partners HealthCare and Harvard Medical School where she engages as an internal innovator at the intersection of clinical medicine, economics, and technology to improve health care delivery. She is also a former investment banker and spent time at the National Bureau of Economic Research. She trained at Harvard College, the University of Pennsylvania School of Medicine, the Wharton School, and Massachusetts General Hospital. She enjoys sailing in the Boston area with her husband.

Our Advisors

Picture Pablo Rodriguez


Pablo Rodriguez is the Director of Research and Innovation and Head of the Barcelona R&D lab at Telefonica Digital. He is also adjunct Professor at the department of computer science at Columbia University (New York) where he teaches Social Networks and Distributed Systems.

With over 15 years of international background in ICT, Pablo has developed his career in the United States as a software architect and entrepreneur in three Silicon Valley start-ups (Inktomi, the search engine of MSN, Yahoo and AOL for more than five years; Netli and Tahoe Networks). He has also worked at Microsoft Research in Cambridge, where he was involved in the design of the Microsoft’s Windows Update system to secure more than 300 million computers, and at Bell-Labs in New Jersey where he made fundamental contributions to P2P networks and mobile computing.

As a result of his work, Pablo has more than 100 scientific publications and patents. He received various international awards for his work, including the IMC/ACM and WWW award, and the “Prix de la Recherche” for innovation excellence in France. He has oftentimes keynoted alongside the Internet pioneers regarding Future Internet architectures. Pablo received his PhD in Computer Science from the Swiss Federal Institute of Technology (EPFL) and an MSc in Computational physics from King´s College, London.

In his current position, he tries to push Internet thinking in new sectors of the economy. Some of such efforts include working with El Bulli Foundation to introduce technology in the area of nouvelle cuisine or working with the Barcelona Football Club defining future strategies for soccer playing. At his core, Pablo is an activist and a peer-progressive.

Picture of Chris Hansen


Chris Hansen specializes in energy sector economics and data analytics, with 20 years of experience in the global energy industry. His current role at Janys Analytics is focused on energy sector advising and the commercialization of social media-dervied products. He is the Representative-elect for the Colorado House of Representatives, District 6, representing the east-central neighborhoods of Denver.

Picture of Samuel Arbesman


Samuel Arbesman is a complex systems scientist and writer. He is a Senior Scholar at the Ewing Marion Kauffman Foundation and a fellow at the Institute for Quantitative Social Science at Harvard University. He is the author of The Half-Life of Facts.

Picture of Yong-Yeol Ahn


Ross Leinweber, CMT - Founder, Investor, Advisor Milwaukee, WI
Ross Leinweber is an expert in macroeconomic analysis and trading, an active investor in commercial real estate, and an investor/advisor in the start-up community.
He currently is founder of Cedar Road Capital, a proprietary trading firm specializing in global macroeconomic analysis and execution. Prior to working at Cedar Road Capital, he served as Managing Partner for Lake Shore Trading, a proprietary futures and options trading firm in Chicago, IL. He also manages Cedar Road Realty, which develops and manages commercial real estate in the Milwaukee, WI market.

Mr. Leinweber has also been an active leader within the Market Techicians Association (MTA). Currently, he is serving as an at-large director on the national Board of Directors and has served as chair of Chicago Regional Chapter, the Charles Dow Award and Annual Awards committees.

He is an active investor and has strategic relationships within the banking, commercial real estate, and social data analytics industries. Mr. Leinweber received his B.B.A from the University of Wisconsin.

Picture of Hayden Hamilton


Hayden has always loved entrepreneurialism. He had a gaggle of small businesses growing up – gutter cleaning, a snack shop, web design – and ultimately started a co-op bookstore in college which challenged the campus monopoly and received a tremendously positive response from students. After receiving a Bachelor’s degree from Pitzer College he received two fellowships – one to look at the impact of tourism on the mountainous communities of Asia, and another to do an MBA at Oxford University. Upon completion of his MBA he accepted a job at Ford of Europe where he helped create and lead an innovation department. After two years he decided to leave the corporate life and moved to San Francisco to explore entrepreneurial opportunities of his own. A few months later he launched ProgressiveRx.com to provide a low-cost option for Americans without health insurance, and a year later launched Progressive Health Worldwide (www.phww.org) to provide free TB clinics for kids in India.

In 2005, while working at the ProgressiveRx office in Bangalore where paper is expensive and often scarce, he printed out a one-page New York Times article and got a second page with a one line URL at the top. Frustrated by this common problem, Hayden searched for a solution without any luck. Roughly six months later he started GreenPrint Technologies. GreenPrint software eliminates trailing pages automatically, as well as any other pages the user doesn’t want before they are printed, and provides extensive print analytics and management tools. GreenPrint allow large companies to better understand their print environment and reduces printing by around 20% for both enterprise and home users, saving larger companies tens of millions of dollars, thousands of trees, and millions of pounds of greenhouse gasses per year. At launch, GreenPrint received a positive writeup by Walt Mossberg in the Wall Street Journal, which led to dozen, and eventually hundreds more press pieces around the world.

In 2007, he started Bright Light Ventures, an entrepreneurial incubator designed to help bring new innovative products and services to market. Bright Lights primary focus has been the creation of a next generation razor blade. After nearly four years of R∓D, Bright Light launched Zafirro (www.zafirro.com) in 2011. Zafirro’s pure sapphire blades are much sharper than steel and last more than 50X as long, creating the opportunity to significantly reduce the 3 billion blades that go into landfills annually. While only high end models are available at the moment, Zafirro hopes to launch a mainstream line in 2014. Zafirro was named one of the “50 Best Inventions” by Time magazine, and was profiled by NPR, The Washington Post, The Daily Mail, The Economist, and The Wall Street Journal.

Bright Light is also responsible for the creation of two other product – an aesthetically appealing cord organizer called Pinza (www.pinzacord.com), and a low cost, high quality contact lens aimed at the Indian market called Luminous (www.luminouslenses.com). Bright Light’s latest project is aimed at providing a low cost alternative to payday loans. It will launch in 2014. Hayden received a Freeman Fellowship and Rotary Ambassadorial Scholarship. He was named one of Inc Magazine’s 30 Under 30 and Computer World’s 40 Under 40. He lives in beautiful Portland, Oregon.