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Stefanos A. Zenios
Stanford University
68Publications
27H-index
2,416Citations
Publications 68
Newest
#1Riitta Katila (Stanford University)H-Index: 16
#2Sruthi M. Thatchenkery (UCL: University College London)H-Index: 2
Last.Stefanos A. Zenios (Stanford University)H-Index: 27
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We explore the impact on innovation that domain experts, i.e., professional end users of a product have as inventors, executives, and board members in a young organization. Using a dataset of 231 surgical instrument ventures spanning a 25-year period alongside in-depth qualitative fieldwork, we find that professional physician–users (surgeons) strengthen innovation in some roles but block it in others. These experts are related to an increase in a firm’s innovation when they take a technology ro...
#2Yichuan DingH-Index: 7
Last.Stefanos A. ZeniosH-Index: 27
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The deceased-donor kidney transplant candidates in the US are ranked according to characteristics of both the donor and the recipient. We seek the ranking policy that achieves the best efficiency-equity tradeoff, taking into account patients' strategic choices. Our approach considers a broad class of ranking policies, which provides approximations to the previously and currently used policies in practice. It also subsumes other policies proposed in the literature previously. As such it supports ...
#1David J. LowskyH-Index: 1
#2Donald K. K. LeeH-Index: 7
Last.Stefanos A. ZeniosH-Index: 27
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A Health Savings Account (HSA) is a tax-advantaged savings account available only to households with high-deductible health insurance. This paper provides initial answers to two questions related to HSAs: 1) How should a household determine its annual contributions as the health status of its members evolve, and 2) do current contribution limits provide households with the flexibility to use HSAs efficiently? To answer these questions, we formulate the household's problem as one of determining a...
#1Joel Goh (Harvard University)H-Index: 9
#2Jeffrey Pfeffer (Stanford University)H-Index: 82
Last.Stefanos A. Zenios (Stanford University)H-Index: 27
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Even though epidemiological evidence links specific workplace stressors to health outcomes, the aggregate contribution of these factors to overall mortality and health spending in the United States is not known. In this paper, we build a model to estimate the excess mortality and incremental health expenditures associated with exposure to the following 10 workplace stressors: unemployment, lack of health insurance, exposure to shift work, long working hours, job insecurity, work–family conflict,...
Postmarketing drug surveillance is the process of monitoring the adverse events of pharmaceutical or medical devices after they are approved by the appropriate regulatory authorities. Historically, such surveillance was based on voluntary reports by medical practitioners, but with the widespread adoption of electronic medical records and comprehensive patient databases, surveillance systems that utilize such data are of considerable interest. Unfortunately, existing methods for analyzing the dat...
#1Stefanos A. Zenios (Stanford University)H-Index: 27
#2Lawrence M. Wein (MIT: Massachusetts Institute of Technology)H-Index: 44
SUMMARY We study pooled (or group) testing as a method for estimating the prevalence of HIV; rather than testing each sample individually, this method combines various samples into a pool and then tests the pool. Existing pooled testing procedures estimate the prevalence using dichotomous test outcomes. However, HIV test outcomes are inherently continuous, and their dichotomization may eliminate useful information. To overcome this problem, we develop a parametric procedure that utilizes the con...
#1Lawrence M. Wein (MIT: Massachusetts Institute of Technology)H-Index: 44
#2Stefanos A. Zenios (Stanford University)H-Index: 27
Last.Michael A. Nowak (University of Oxford)H-Index: 127
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Abstract Motivated by the inability of current drug treatment to provide long-term benefit to HIV-infected individuals, we derive HIV therapeutic strategies by formulating and analyzing a mathematical control problem. The model tracks the dynamics of uninfected and infected CD4 + cells and free plasma virus, and allows the virus to mutate into various strains. At each point in time, several different therapeutic options are available, where each option corresponds to a combination of reverse tra...
#1Joel GohH-Index: 9
#2Jeffrey PfefferH-Index: 82
Last.Stefanos A. ZeniosH-Index: 27
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Extensive research focuses on the causes of workplace-induced stress. However, policy efforts to tackle the ever-increasing health costs and poor health outcomes in the United States have largely ignored the health effects of psychosocial workplace stressors such as high job demands, economic insecurity, and long work hours. Using meta-analysis, we summarize 228 studies assessing the effects of ten workplace stressors on four health outcomes. We find that job insecurity increases the odds of rep...
#1Joel GohH-Index: 9
#2Mohsen BayatiH-Index: 22
Last.David MooreH-Index: 66
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Cost-effectiveness studies of medical innovations often suffer from data inadequacy. When Markov chains are used as a modeling framework for such studies, this data inadequacy can manifest itself as imprecise estimates for many elements of the transition matrix. In this paper, we study how to compute maximal and minimal values for the discounted value of the chain (with respect to a vector of state-wise costs or rewards) as these uncertain transition parameters jointly vary within a given uncert...
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