We are WeHealth

The WeHealth platform helps public health departments, universities and senior living communities reduce the threat and burden of infectious diseases. WeHealth notifies individuals of their risk of getting infected, empowering them to receive early testing and effective treatment, while also helping protect other members of the community. WeHealth focuses deeply on science, privacy and human-centered design to build high trust and maximize impact.


Our Passionate Team

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Sameer Halai

Chief Executive Officer

$200M + fundraised across
3 startups (2 VC backed). Built products used by 1bn + users.

Microsoft, Limeade, Jirav,



Liane Jollon

Head of Public Health

$3.5M funding raised. AMA Award for Outstanding Government Service. Executive Director San Juan Basin Public Health.

Columbia University


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Pavlo Apisov

Lead Android Developer


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Rajat Sharma



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Niti Patel

UX Designer



LeCario Benashley

Tribal Public Health Engagement


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Stephanie Tackach

PR & Communications


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James Petrie

Head of Research

Key contributor to Bluetooth proximity detection white paper. Bluetooth Beacon Patent pending.

University of Waterloo


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Joanna Masel

Head of Science

70+ publications in fields of infectious disease, biochemistry, aging, economics, and education. Author of “Bypass Wall Street: A Biologist’s Guide to the Rat Race”.

University of Arizona


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Travis Marsh



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Rebecca Young



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Jeff Schwaber



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Larry Singer



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Tina White



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Sarah Noyes

External Recruiter


Join our team

The team at WeHealth has come together from a multitude of backgrounds and experiences with a shared belief that we can make a positive impact on public health issues. If you are driven by desire to work for change, we invite you to apply.



The timing of COVID-19 transmission.

Ferretti, L, Ledda, A, Wymant, C, Zhao, L, Ledda, V, Abeler-Dörner, L, Kendall, M, Nurtay, A, Cheng, H-Y, Ng, T-C, Lin, H-H, Hinch, R, Masel, J, Kilpatrick, AM, and Fraser, C. 2020. medRxiv:2020.09.04.20188516.

Publisher logo - medRxiv

Modelling the effectiveness and social costs of daily lateral flow antigen tests versus quarantine in preventing onward transmission of COVID-19 from traced contacts.

Ferretti, L, Wymant, C, Nurtay, A, Zhao, L, Hinch, R, Bonsall, D, Kendall, M, Masel, J, Bell, J, Hopkins, S, Kilpatrick, AM, Peto, T, Abeler-Dörner, L, and Fraser, C. 2021. medRxiv:2021.08.06.21261725.

Publisher logo - medRxiv

Quantifying meaningful adoption of a SARS-CoV-2 exposure notification app on the campus of the University of Arizona.

Masel, J, Shilen, AN, Helming, BH, Rutschman, JD, Windham, GD, Pogreba Brown, K, and Ernst, K. 2021. medRxiv:2021.02.02.21251022.

Publisher logo - the royal society

The economic value of quarantine is higher at lower case prevalence, with quarantine justified at lower risk of infection.

Petrie, J, and Masel, J. 2021. Journal of The Royal Society Interface 18:20210459.

Publisher logo - WeHealth

Slowing the Spread of Infectious Diseases Using Crowdsourced Data.

von Arx, S, Becker-Mayer, I, Blank, D, Colligan, J, Fenwick, R, Hittle, M, Ingle, M, Nash, O, Nguyen, V, Petrie, J, Schwaber, J, Szabo, Z, Veeraghanta, A, Voloshin, M, White, T, and Xue, H. 2020. IEEE Data Eng Bull 43:71-82.

Publisher logo - risk analysis international journal

Quantifying SARS-CoV-2 infection risk within the Google/Apple exposure notification framework to inform quarantine recommendations.

Wilson, AM, Aviles, N, Petrie, JI, Beamer, PI, Szabo, Z, Xie, M, McIllece, J, Chen, Y, Son, Y-J, Halai, S, White, T, Ernst, KC, and Masel, J. 2021. Risk Analysis published online ahead of print.

A platform for public health built on trust.

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