Welcome! I am an associate professor of mathematics at Ohio State University. My research interests include modeling infectious disease dynamics, network science, data science, and the use of data-driven methods to promote informed civic engagement.

I am affiliated with the Mathematical Biosciences Instutute and the Division of Epidemiology. I am also co-director of the Ecology, Epidemiology, and Population Health Thematic Program of the Infectious Diseases Institute.

I am co-founder and director of the Center for the Study of Networks and Society, a non-profit for using data for social good. Some work we have been doing on data and society initiatives can be found here.

I am co-organizing the Applied Math Seminar. Please get in touch if you would like to give a talk.

Here is a brief CV.

- Tien JH, Cherng ST, Eisenberg MC, Porter MA. Online reactions to the 2017 'Unite the Right' rally in Charlottesville: measuring polarization in Twitter networks using media followership.
*Applied Network Science.*Accepted. Arxiv preprint### Published

- Choi B, Busch S, Kazadi D, Ilunga B, Okitolonda E, Dai Y, Lumpkin R, Saucedo O, KhudaBukhsh W, Tien JH, Yotebieng M, Kenah E, Rempala G. 2019. Modeling outbreak data: analysis of a 2012 Ebola Virus Disease epidemic in DRC.
*Biomath*(8): 1910037. - Schnell PM, Shao Y, Pomeroy LW, Tien JH, Moritz M, Garabed R. 2019. Modeling the role of carrier and mobile herds on foot-and-mouth disease virus endemicity in the Far North Region of Cameroon.
*Epidemics.*doi:10.1016/j.epidem.2019.100355. - Osborne MT, Wang X, Tien JH. 2018. Complex contagion leads to complex dynamics in models coupling behavior and disease.
*Journal of Biological Dynamics.*12(1): 1035-1058. - Jacobsen KA, Burch MG, Tien JH, Rempala GA. 2018. The large graph limit of a stochastic epidemic model on a dynamic multilayer network.
*Journal of Biological Dynamics.*12(1): 746-788. Arxiv preprint. - Jacobsen KA, Tien JH. 2018. A generalized inverse for graphs with absorption.
*Linear Algebra and its Applications*537: 118-147. - Zivich PN, Tatham L, Lung K, Tien JH, Bollinger CW, Bower JK. 2017. Influenza vaccination status and outcomes among influenza-associated hospitalizations in Columbus, Ohio (2012-2015).
*Epidemiology and Infection*145(15): 3284-3293. - Lee EC, Kelly MR, Ochocki BM, Akinwumi SM, Hamre KES, Tien JH, Eisenberg MC. 2017. Model distinguishability and inference robustness in mechanisms of cholera transmission and loss of immunity.
*Journal of Theoretical Biology*420: 68-81. - Burch MG, Jacobsen KA, Tien JH, Rempala GA. 2017. Network-based analysis of a small Ebola outbreak.
*Mathematical Biosciences and Engineering.*14(1): 67-77. - Lin C-J, Deger KA, Tien JH. 2016. Modeling the trade-off between transmissibility and contact in infectious disease dynamics.
*Mathematical Biosciences.*277: 15-24. - Kelly MR, Tien JH, Eisenberg MC, Lenhart S. 2016. The impact of spatial arrangements on epidemic disease dynamics and intervention strategies.
*Journal of Biological Dynamics.*10(1): 222-249. - Tien JH, Shuai Z, Eisenberg MC, van den Driessche P. 2015. Disease invasion on community networks with environmental pathogen movement.
*Journal of Mathematical Biology.*70(5): 1065-1092. - Healy-Profitos JM, Mouhaman A, Lee S, Garabed R, Moritz M, Piperata B, Tien J, Bisesi M, Lee J. 2014. Muddying the waters: a new area of concern for drinking water contamination in Cameroon.
*International Journal of Environmental Research and Public Health.*11(12): 12454-12472. - Devault AM, Golding GB, Waglechner N, Enk JM, Kuch M, Tien JH, Shi M, Fisman DN, Dhody AN, Forrest S, Bos KI, Earn DJD, Holmes EC, Poinar HN. 2014. Second-pandemic strain of
*Vibrio cholerae*from the Philadelphia cholera outbreak of 1849.*New England Journal of Medicine.*doi: 10.1056/NEJMoa1308663. - Eisenberg MC, Kujbida G, Tuite AR, Fisman DN, Tien JH. 2013. Examining rainfall and cholera dynamics in Haiti using statistical and dynamic modeling approaches.
*Epidemics.*5: 197-207. - Robertson SL, Eisenberg MC, Tien JH. 2013. Heterogeneity in multiple transmission pathways: modeling the spread of cholera and other waterborne disease in networks with a common water source.
*Journal of Biological Dynamics.*7(1): 254-275. - Eisenberg MC, Shuai Z, Tien JH, van den Driessche P. 2013. A cholera model in a patchy environment with water and human movement.
*Mathematical Biosciences.*246(1): 105-112. doi: 10.1016/j.mbs.2013.08.003. - Eisenberg MC, Robertson SL, Tien JH. 2013. Identifiability and estimation of multiple transmission pathways in cholera and waterborne disease.
*Journal of Theoretical Biology.*324: 84-102. - Shuai Z, Tien JH, van den Driessche P. 2012. Cholera models with hyperinfectivity and temporary immunity.
*Bulletin of Mathematical Biology.*74(10): 2423-2445. doi: 10.1007/s11538-012-9759-4. - Holte S, Randolph T, Ding J, Tien JH, McClelland R, Baeten J, Overbaugh J. 2012. Efficient use of longitudinal CD4 counts and viral load measures in survival analysis.
*Statistics in Medicine.*31(19): 2086-2097. doi: 10.1002/sim.5318. - Tuite AR, Tien JH, Eisenberg MC, Earn DJD, Ma J, Fisman DN. 2011. Cholera epidemic in Haiti, 2010 - using a transmission model to explain spatial spread of disease and identify optimal control interventions.
*Annals of Internal Medicine.*154(9): 593-601. - Tien JH, Poinar HN, Fisman DN, Earn DJD. 2011. Herald waves of cholera in 19th century London.
*Journal of the Royal Society Interface*8(58): 756-760. doi:10.1098/rsif.2010.0494. - Lyles D, Tien JH, McCobb DP, Zeeman ML. 2010. Pituitary network connectivity as a mechanism for the LH surge.
*Journal of Neuroendocrinology*22(12): 1267-1278. - Tien JH, Earn DJD. 2010. Multiple transmission pathways and disease dynamics in a waterborne pathogen model.
*Bulletin of Mathematical Biology*72(6): 1506-1533. - Tien JH, Guckenheimer J. 2008. Parameter estimation for bursting neural models.
*Journal of Computational Neuroscience*24(3): 358-373. - Guckenheimer J, Tien JH. 2007. Commentary on "Parameter estimation for differential equations: a generalized smoothing approach" by Ramsay JO, Hooker G, Campbell D, Cao J.
*Journal of the Royal Statistical Society B*69(5): 741-770. - Guckenheimer J, Tien JH, Willms AR. 2005. Bifurcations in the fast dynamics of neurons: implications for bursting. In:
*Bursting: the genesis of rhythm in the nervous system.*(Eds.) Coombes S, Bresloff PC. World Scientific Press, pp. 91-124. - Tien JH, Hazelton WD, Sparks R, Ulrich CM. 2005. A Michaelis-Menten-style model for the autocatalytic enzyme prostaglandin H synthase.
*Bulletin of Mathematical Biology*67: 683-700. - Tien JH, Lyles D, Zeeman ML. 2005. A potential role of modulating inositol 1,4,5-trisphosphate receptor desensitization and recovery rates in regulating ovulation.
*Journal of Theoretical Biology*232(1): 105-117. - Hazelton WD, Tien JH, Donato VW, Sparks R, Ulrich CM. 2004. Prostaglandin H syntases: members of a class of quasi-linear threshold switches.
*Biochemical Pharmacology*68(3): 423-432. - Tien JH, Levin SA, Rubenstein DI. 2004. Dynamics of fish shoals: identifying key decision rules.
*Evolutionary Ecology Research*6: 555-565.

I am currently teaching Ordinary Differential Equations (Math 2255).

I teach a course on the *Mathematics of Infectious Disease Dynamics*, MATH / PUBH-EPI 5421. The course will be offered in Spring 2020. If you are interested in learning about modeling infectious disease dynamics, for example for use in your own research or future employment, please check out the class!

Some courses I have taught previously are listed below:

- Fall 2015: Dynamical systems (Math 4556).
- Spring 2014: Calculus I (Math 1151).
- Spring 2013: Mathematical modeling for the life sciences (Math 1157).
- Autumn 2012: Mathematical topics for engineers (Math 2177).
- Winter 2012, Spring 2011: Ordinary and partial differential equations (Math 415).
- Fall 2010: Topics in mathematical ecology (co-taught with Yuan Lou, Libby Marschall, Ian Hamilton).
- Spring 2009: Differential equations III (Math 617).
- Winter 2009: Introduction to real analysis (Math 547).

**Post-docs** interested in working with me are encouraged to apply for the three year postdoctoral fellowships at the Mathematical Biosciences Institute (MBI) here at Ohio State.

Interested **graduate students** can apply to either the math department's Ph.D. program or the Master's program in mathematical biology. An overview of all graduate programs in the department can be found here.

I also work with students in the Epidemiology Division of the College of Public Health.

**Undergraduates** at OSU can study mathematical biology through the biology track within the mathematics major. For several years, OSU was home to the RUMBA program, which provided opportunities to pursue research in mathematical biology. MBI also holds an annual summer program on mathematical biology for undergraduates. This latter program is open to undergraduates outside of Ohio State as well.

Current and former students and postdocs I have worked with are listed here.