Bio


Johari is broadly interested in the design, economic analysis, and operation of online platforms, as well as statistical and machine learning techniques used by these platforms (such as search, recommendation, matching, and pricing algorithms).

Academic Appointments


Honors & Awards


  • George E. Nicholson Student Paper Competition (First Place), INFORMS (2003)
  • Doctoral Dissertation Award (Honorable Mention), ACM (2004)
  • George M. Sprowls Doctoral Dissertation Award, MIT EECS (2004)
  • Management Science and Engineering Graduate Teaching Award, Stanford (2005)
  • Okawa Foundation Research Grant, Okawa Foundation (2005)
  • Telecommunications Dissertation Award, INFORMS (2006)
  • CAREER Award, National Science Foundation (2007)
  • Foundation Award, UPS (2008)
  • Management Science and Engineering Graduate Teaching Award, Stanford (2010)
  • Management Science and Engineering Graduate Teaching Award, Stanford (2017)
  • Best Paper Award, ACM (2018)

Boards, Advisory Committees, Professional Organizations


  • Program co-chair, ACM Economics and Computation (2019 - 2019)
  • Co-creator and co-organizer, Marketplace Innovation Workshop (2015 - 2019)

Professional Education


  • PhD, MIT (2004)

2021-22 Courses


Stanford Advisees


All Publications


  • Experimental Design in Two-Sided Platforms: An Analysis of Bias MANAGEMENT SCIENCE Johari, R., Li, H., Liskovich, I., Weintraub, G. Y. 2022
  • Teamwork, Targets, Technology, and Tight Control in Newly Diagnosed Type 1 Diabetes: Pilot 4T Study. The Journal of clinical endocrinology and metabolism Prahalad, P., Ding, V. Y., Zaharieva, D. P., Addala, A., Johari, R., Scheinker, D., Desai, M., Hood, K., Maahs, D. M. 2021

    Abstract

    CONTEXT: Youth with type 1 diabetes (T1D) do not meet hemoglobin A1c (HbA1c) targets.OBJECTIVE: To assess HbA1c outcomes in children with new onset T1D enrolled in the Teamwork, Targets, Technology and Tight Control (4T) Study.METHOD: HbA1c levels were compared between the 4T and Historical cohorts. HbA1c differences between cohorts were estimated using locally estimated scatter plot smoothing (LOESS). The change from nadir HbA1c (month 4) to 12 months post-diagnosis was estimated by cohort using a piecewise mixed effects regression model accounting for age at diagnosis, sex, ethnicity, and insurance type.SETTING AND PARTICIPANTS: We recruited 135 youth with newly diagnosed T1D at Stanford Children's Health.INTERVENTION: Starting July 2018, all youth within the first month of T1D diagnosis were offered continuous glucose monitoring (CGM) initiation and remote CGM data review was added in March 2019.MAIN OUTCOME MEASURE: HbA1c.RESULTS: HbA1c at 6, 9, and 12 months post-diagnosis was lower in the 4T cohort than in the Historic cohort (-0.54%, -0.52%, and -0.58%, respectively). Within the 4T cohort, HbA1c at 6, 9, and 12 months post-diagnosis was lower in those patients with Remote Monitoring than those without (-0.14%, -0.18%, -0.14%, respectively). Multivariable regression analysis showed that the 4T cohort experienced a significantly lower increase in HbA1c between months 4 and 12 (p < 0.001).CONCLUSIONS: A technology-enabled team-based approach to intensified new onset education involving target setting, CGM initiation, and remote data review significantly decreased HbA1c in youth with T1D 12 months post-diagnosis.

    View details for DOI 10.1210/clinem/dgab859

    View details for PubMedID 34850024

  • Always Valid Inference: Continuous Monitoring of A/B Tests OPERATIONS RESEARCH Johari, R., Koomen, P., Pekelis, L., Walsh, D. 2021
  • Population-level management of Type 1 diabetes via continuous glucose monitoring and algorithm-enabled patient prioritization: Precision health meets population health. Pediatric diabetes Ferstad, J. O., Vallon, J. J., Jun, D., Gu, A., Vitko, A., Morales, D. P., Leverenz, J., Lee, M. Y., Leverenz, B., Vasilakis, C., Osmanlliu, E., Prahalad, P., Maahs, D. M., Johari, R., Scheinker, D. 2021

    Abstract

    OBJECTIVE: To develop and scale algorithm-enabled patient prioritization to improve population-level management of type 1 diabetes (T1D) in a pediatric clinic with fixed resources, using telemedicine and remote monitoring of patients via continuous glucose monitor (CGM) data review.RESEARCH DESIGN AND METHODS: We adapted consensus glucose targets for T1D patients using CGM to identify interpretable clinical criteria to prioritize patients for weekly provider review. The criteria were constructed to manage the number of patients reviewed weekly and identify patients who most needed provider contact. We developed an interactive dashboard to display CGM data relevant for the patients prioritized for review.RESULTS: The introduction of the new criteria and interactive dashboard was associated with a 60% reduction in the mean time spent by diabetes team members who remotely and asynchronously reviewed patient data and contacted patients, from 3.2±0.20 to 1.3±0.24minutes per patient per week. Given fixed resources for review, this corresponded to an estimated 147% increase in weekly clinic capacity. Patients who qualified for and received remote review (n=58) have associated 8.8 percentage points (pp) (95% CI=0.6-16.9pp) greater time-in-range (70-180mg/dL) glucoses compared to 25 control patients who did not qualify at twelve months after T1D onset.CONCLUSIONS: An algorithm-enabled prioritization of T1D patients with CGM for asynchronous remote review reduced provider time spent per patient and was associated with improved time-in-range. This article is protected by copyright. All rights reserved.

    View details for DOI 10.1111/pedi.13256

    View details for PubMedID 34374183

  • Managing Congestion in Matching Markets M&SOM-MANUFACTURING & SERVICE OPERATIONS MANAGEMENT Arnosti, N., Johari, R., Kanoria, Y. 2021; 23 (3): 620-636
  • Designing Informative Rating Systems: Evidence from an Online Labor Market M&SOM-MANUFACTURING & SERVICE OPERATIONS MANAGEMENT Garg, N., Johari, R. 2021; 23 (3): 589-605
  • Matching While Learning OPERATIONS RESEARCH Johari, R., Kamble, V., Kanoria, Y. 2021; 69 (2): 655–81
  • Studying Undergraduate Course Consideration at Scale AERA OPEN Chaturapruek, S., Dalberg, T., Thompson, M. E., Giebel, S., Harrison, M. H., Johari, R., Stevens, M. L., Kizilcec, R. F. 2021; 7
  • Learning Unknown Service Rates in Queues: A Multiarmed Bandit Approach OPERATIONS RESEARCH Krishnasamy, S., Sen, R., Johari, R., Shakkottai, S. 2021; 69 (1): 315–30
  • Adaptive Experimental Design with Temporal Interference: A Maximum Likelihood Approach Glynn, P., Johari, R., Rasouli, M., Larochelle, H., Ranzato, M., Hadsell, R., Balcan, M. F., Lin, H. NEURAL INFORMATION PROCESSING SYSTEMS (NIPS). 2020
  • Multi-Service Battery Operation with Cloud Electricity Storage Rasouli, M., Sun, T., Pache, C., Panciatici, P., Maeght, J., Johari, R., Rajagopal, R., IEEE IEEE. 2020
  • Competition and Efficiency of Coalitions in Cournot Games With Uncertainty IEEE TRANSACTIONS ON CONTROL OF NETWORK SYSTEMS Zhang, B., Johari, R., Rajagopal, R. 2019; 6 (2): 884–96
  • Semi-Parametric Dynamic Contextual Pricing Shah, V., Blanchet, J., Johari, R., Wallach, H., Larochelle, H., Beygelzimer, A., d'Alche-Buc, F., Fox, E., Garnett, R. NEURAL INFORMATION PROCESSING SYSTEMS (NIPS). 2019
  • Optimal Testing in the Experiment-rich Regime Schmit, S., Shah, V., Johari, R., Chaudhuri, K., Sugiyama, M. MICROTOME PUBLISHING. 2019: 626–33
  • Designing Optimal Binary Rating Systems Garg, N., Johari, R., Chaudhuri, K., Sugiyama, M. MICROTOME PUBLISHING. 2019
  • Bandit Learning with Positive Externalities Shah, V., Blanchet, J., Johari, R., Bengio, S., Wallach, H., Larochelle, H., Grauman, K., CesaBianchi, N., Garnett, R. NEURAL INFORMATION PROCESSING SYSTEMS (NIPS). 2018
  • On Learning the c mu Rule in Single and Parallel Server Networks Krishnasamy, S., Arapostathis, A., Johari, R., Shakkottai, S., IEEE IEEE. 2018: 153–54
  • Pricing and referrals in diffusion on networks GAMES AND ECONOMIC BEHAVIOR Leduc, M. V., Jackson, M. O., Johari, R. 2017; 104: 568–94
  • The Importance of Exploration in Online Marketplaces IEEE INTERNET COMPUTING Banerjee, S., Johari, R., Zhou, Z. 2016; 20 (1): 20-26
  • Competition and Coalition Formation of Renewable Power Producers IEEE TRANSACTIONS ON POWER SYSTEMS Zhang, B., Johari, R., Rajagopal, R. 2015; 30 (3): 1624-1632
  • Equilibria of dynamic games with many players: Existence, approximation, and market structure JOURNAL OF ECONOMIC THEORY Adlakha, S., Johari, R., Weintraub, G. Y. 2015; 156: 269-316
  • Can I Take a Peek? Continuous Monitoring of Online A/B Tests Johari, R., ACM ASSOC COMPUTING MACHINERY. 2015: 915
  • Mean Field Equilibria of Dynamic Auctions with Learning MANAGEMENT SCIENCE Iyer, K., Johari, R., Sundararajan, M. 2014; 60 (12): 2949-2970
  • A Buffer-Based Approach to Rate Adaptation: Evidence from a Large Video Streaming Service SIGCOMM Conference Huang, T., Johari, R., McKeown, N., Trunnell, M., Watson, M. ASSOC COMPUTING MACHINERY. 2014: 187–98
  • Information Aggregation and Allocative Efficiency in Smooth Markets MANAGEMENT SCIENCE Iyer, K., Johari, R., Moallemi, C. C. 2014; 60 (10): 2509-2524
  • Mean Field Equilibrium in Dynamic Games with Strategic Complementarities OPERATIONS RESEARCH Adlakha, S., Johari, R. 2013; 61 (4): 971-989
  • Dynamics in tree formation games GAMES AND ECONOMIC BEHAVIOR Arcaute, E., Dyagilev, K., Johari, R., Mannor, S. 2013; 79: 1-29
  • Mean Field Equilibria of Multi Armed Bandit Games 50th Annual Allerton Conference on Communication, Control, and Computing (Allerton) Gummadi, R., Johari, R., Yu, J. Y. IEEE. 2013: 1110–1110
  • Heavy Traffic Approximation of Equilibria in Resource Sharing Games IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS Wu, Y., Loc Bui, L., Johari, R. 2012; 30 (11): 2200-2209
  • Traffic Engineering With Semiautonomous Users: A Game-Theoretic Perspective IEEE-ACM TRANSACTIONS ON NETWORKING DiPalantino, D., Johari, R. 2012; 20 (6): 1938-1949
  • Information and the value of execution guarantees. Iyer, K., Johari, R., Moallemi , C., C. 2012
  • Mean field equilibria of multiarmed bandit games. Gummadi, R., Johari, R., Yu , J.-Y. 2012
  • Resource management with semiautonomous users. To appear in IEEE/ACM Transactions on Networking. DiPalantino, D., Johari, R. 2012
  • Mean Field Equilibria of Dynamic Auctions with Learning SI GECOM EXCHANGES Iyer, K., Johari, R., Sundararajan, M. 2011; 10 (3): 10–14
  • Bilateral and Multilateral Exchanges for Peer-Assisted Content Distribution IEEE-ACM TRANSACTIONS ON NETWORKING Aperjis, C., Johari, R., Freedman, M. J. 2011; 19 (5): 1290-1303
  • Parameterized Supply Function Bidding: Equilibrium and Efficiency OPERATIONS RESEARCH Johari, R., Tsitsiklis, J. N. 2011; 59 (5): 1079-1089
  • Competition and contracting in service industries OPERATIONS RESEARCH LETTERS DiPalantino, D., Johari, R., Weintraub, G. Y. 2011; 39 (5): 390-396
  • How Many Tiers? Pricing in the Internet Transit Market COMPUTER COMMUNICATION REVIEW Valancius, V., Lumezanu, C., Feamster, N., Johari, R., Vazirani, V. V. 2011; 41 (4): 194-205
  • Heavy traffic approximation of equilibria in resource sharing games. Wu, Y., Bui, L., Johari, R. 2011
  • Economic Modeling in Networking: A Primer FOUNDATIONS AND TRENDS IN NETWORKING Berry, R. A., Johari, R. 2011; 6 (3): 165–286

    View details for DOI 10.1561/1300000011

    View details for Web of Science ID 000420146100001

  • Committing bandits. Bui, L., Johari, R., Mannor, S.  2011
  • How many tiers? Pricing in the Internet transit market. Valancius, V., Lumezanu, C., Feamster, N., Johari, R., Vazirani, V. 2011
  • Mean field equilibria of dynamic auctions with learning. Iyer, K., Johari, R., Sundararajan, M. 2011
  • Uncoupled Potentials for Proportional Allocation Markets 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC) Nadav, U., Johari, R., Roughgarden, T. IEEE. 2011: 4479–4484
  • Investment and Market Structure in Industries with Congestion OPERATIONS RESEARCH Johari, R., Weintraub, G. Y., Van Roy, B. 2010; 58 (5): 1303-1317
  • Designing Aggregation Mechanisms for Reputation Systems in Online Marketplaces SI GECOM EXCHANGES Aperjis, C., Johari, R. 2010; 9 (1)
  • Optimal Windows for Aggregating Ratings in Electronic Marketplaces MANAGEMENT SCIENCE Aperjis, C., Johari, R. 2010; 56 (5): 864-880
  • Demand-Aware Content Distribution on the Internet IEEE-ACM TRANSACTIONS ON NETWORKING Shakkottai, S., Johari, R. 2010; 18 (2): 476-489
  • Information-Theoretic Operating Regimes of Large Wireless Networks IEEE TRANSACTIONS ON INFORMATION THEORY Ozgur, A., Johari, R., Tse, D. N., Leveque, O. 2010; 56 (1): 427-437
  • Mean field equilibrium in dynamic games with complementarities. Adlakha, S., Johari, R. 2010
  • Information aggregation in smooth markets. Iyer, K., Johari, R., Moallemi, C., C. 2010
  • Congestible services and network effects. Johari, R., Kumar, S. 2010
  • Information theoretic operating regimes of large wireless networks. IEEE Transactions on Information Theory Ozgur, A., Johari, R., Tse, D., Leveque, O. 2010; 1 (56): 427-437
  • Mean field analysis for large population stochastic games. Adlakha, S., Johari, R., Weintraub, G., Y., Goldsmith, A. 2010
  • On Oblivious Equilibrium in Large Population Stochastic Games 49th IEEE Conference on Decision and Control (CDC) Adlakha, S., Johari, R., Weintraub, G. Y., Goldsmith, A. IEEE. 2010: 3117–3124
  • Mean Field Equilibrium in Dynamic Games with Complementarities 49th IEEE Conference on Decision and Control (CDC) Adlakha, S., Johari, R. IEEE. 2010: 6633–6638
  • Network Formation: Bilateral Contracting and Myopic Dynamics IEEE TRANSACTIONS ON AUTOMATIC CONTROL Arcaute, E., Johari, R., Mannor, S. 2009; 54 (8): 1765-1778
  • Efficiency of Scalar-Parameterized Mechanisms 43rd Annual Allerton Conference on Communication, Control and Computing Johari, R., Tsitsiklis, J. N. INFORMS. 2009: 823–39
  • Supermodular Network Games 47th Annual Allerton Conference on Communication, Control, and Computing Manshadi, V. H., Johari, R. IEEE. 2009: 1369–1376
  • Network formation: bilateral contracting and myopic dynamics. IEEE Transactions on Automatic Control Arcaute, E., Johari, R., Mannor, S. 2009; 8 (54): 1765-1778
  • Comparing Multilateral and Bilateral Exchange Models for Content Distribution IEEE Information Theory Workshop on Networking and Information Theory Aperjis, C., Freedman, M. J., Johari, R. IEEE. 2009: 145–146
  • Traffic Engineering, Content Distribution, and Continuous Potential Games International Conference on Game Theory for Networks DiPalantino, D., Johari, R. IEEE. 2009: 98–99
  • Oblivious Equilibrium: An Approximation to Large Population Dynamic Games with Concave Utility International Conference on Game Theory for Networks Adlakha, S., Johari, R., Weintraub, G., Goldsmith, A. IEEE. 2009: 68–69
  • A Mean Field Approach to Competition in Large Scale Wireless Systems MobiHoc S3 Workshop Adlakha, S., Johari, R., Weintraub, G., Goldsmith, A. ASSOC COMPUTING MACHINERY. 2009: 13–15
  • Traffic Engineering vs. Content Distribution: A Game Theoretic Perspective IEEE INFOCOM Conference 2009 DiPalantino, D., Johari, R. IEEE. 2009: 540–548
  • Lump-Sum Markets for Air Traffic Flow Control with Competitive Airlines PROCEEDINGS OF THE IEEE Waslander, S. L., Roy, K., Johari, R., Tomlin, C. J. 2008; 96 (12): 2113-2130
  • Information Theoretic Operating Regimes of Large Wireless Networks IEEE International Symposium on Information Theory Oezguer, A., Johari, R., Tse, D., Leveque, O. IEEE. 2008: 186–190
  • Local myopic dynamics in network formation games. Arcaute, E., Johari, R., Mannor, S. 2008
  • Peer-assisted content distribution with prices. Aperjis, C., Freedman, M., J., Johari, R. 2008
  • Oblivious equilibrium for general stochastic games with unbounded costs. Adlakha, S., Johari, R., Weintraub, G., Y., Goldsmith , A. 2008
  • Oblivious equilibrium for general stochastic games with concave costs. Adlakha, S., Johari, R., Weintraub, G., Y., Goldsmith , A. 2008
  • A comparison of bilateral and multilateral exchanges for peer-assisted content distribution. Aperjis, C., Freedman, M., J., Johari, R. 2008
  • Prices are right: aligning incentives for peer-assisted content distribution. Freedman, M., J., Aperjis, C., Johari, R. 2008
  • A comparison of bilateral and multilateral exchanges for peer-assisted content distribution. Aperjis, C., Freedman, M., J., Johari, R. 2008
  • Local Two-Stage Myopic Dynamics for Network Formation Games 4th International Workshop on Internet and Network Economics Arcaute, E., Johari, R., Mannor, S. SPRINGER-VERLAG BERLIN. 2008: 263–277
  • Oblivious Equilibrium for Stochastic Games with Concave Utility 46th Annual Allerton Conference on Communication, Control and Computing Adlakha, S., Johari, R., Weintraub, G., Goldsmith, A. IEEE. 2008: 1304–1308
  • Oblivious Equilibrium for Large-Scale Stochastic Games with Unbounded Costs 47th IEEE Conference on Decision and Control Adlakha, S., Johari, R., Weintraub, G., Goldsmith, A. IEEE. 2008: 5531–5538
  • Local Dynamics for Network Formation Games 46th Annual Allerton Conference on Communication, Control and Computing Arcaute, E., Johari, R., Mannor, S. IEEE. 2008: 937–938
  • Implications of autonomy for the expressiveness of policy routing IEEE-ACM TRANSACTIONS ON NETWORKING Feamster, N., Johari, R., Balakrishnan, H. 2007; 15 (6): 1266-1279
  • Partially optimal routing 40th Annual Conference on Information Sciences and Systems (CISS) Acemoglu, D., Johari, R., Ozdaglar, A. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. 2007: 1148–60
  • Network formation: Bilateral contracting and myopic dynamics 3rd International Workshop on Internet and Network Economics Arcaute, E., Johari, R., Mannor, S. SPRINGER-VERLAG BERLIN. 2007: 191–207
  • Efficiency loss and the design of scalable resource allocation mechanisms. Algorithmic Game Theory Johari , R. edited by Nisan, N., Roughgarden, T., Tardos,  E. Cambridge University Press: Cambridge, United Kingdom.. 2007: 543–567
  • Revenue management for content delivery. Shakkottai, S., Johari, R. 2007
  • Network formation: bilateral contracting and myopic dynamics. Arcaute, E., Johari, R., Mannor, S. 2007
  • Oblivious equilibrium for general stochastic games with many players. Abhishek, V., Adlakha, S., Johari, R., Weintraub, G., Y. 2007
  • Dynamics and stability in network formation games with bilateral contracts 46th IEEE Conference on Decision and Control Arcaute, E., Dallal, E., Johari, R., Mannor, S. IEEE. 2007: 5871–5878
  • A contract-based model for directed network formation GAMES AND ECONOMIC BEHAVIOR Johari, R., Mannor, S., Tsitsiklis, J. N. 2006; 56 (2): 201-224
  • A scalable network resource allocation mechanism with bounded efficiency loss IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS Johari, R., Tsitsikils, J. N. 2006; 24 (5): 992-999
  • Paradoxes of traffic engineering with partially optimal routing 40th Annual Conference on Information Sciences and Systems (CISS) Acemoglu, D., Johari, R., Ozdaglar, A. IEEE. 2006: 661–667
  • Positive externalities and optimal scale. Kumar, S., Johari, R. 2006
  • A peer-to-peer system as an exchange economy. Aperjis, C., Johari, R. 2006
  • Efficiency-loss in a network resource allocation game: The case of elastic supply IEEE TRANSACTIONS ON AUTOMATIC CONTROL Johari, R., Mannor, S., Tsitsiklis, J. N. 2005; 50 (11): 1712-1724
  • Implications of autonomy for the expressiveness of policy routing SIGCOMM/ACM Conference on Computer Communications Feamster, N., Johari, R., Balakrishnan, H. ASSOC COMPUTING MACHINERY. 2005: 25–36
  • A game theoretic view of efficiency loss in resource allocation Symposium on Systems, Control, and Networks Johari, R., Tsitsiklis, J. N. BIRKHAUSER BOSTON. 2005: 203–223
  • Communication requirements of VCG-like mechanisms in convex environments. Johari, R., Tsitsiklis, J., N. 2005
  • Efficiency loss in a network resource allocation game: the case of elastic supply. IEEE Transactions on Automatic Control Johari, R., Mannor, S., Tsitsiklis, J., N. 2005; 11 (50): 1712-1724
  • Efficiency loss in a network resource allocation game MATHEMATICS OF OPERATIONS RESEARCH Johari, R., Tsitsiklis, J. N. 2004; 29 (3): 407-435
  • Routing and peering in a competitive Internet 43rd IEEE Conference on Decision and Control Johari, R., Tsitsiklis, J. N. IEEE. 2004: 1556–1561
  • Efficiency loss in a resource allocation game: A single link in elastic supply 43rd IEEE Conference on Decision and Control Johari, R., Mannor, S., Tsitsiklis, J. N. IEEE. 2004: 4679–4683
  • Network resource allocation and a congestion game: the single link case. Johari, R., Tsitsiklis, J., N. 2003
  • End-to-end congestion control for the Internet: delays and stability. IEEE/ACM Transactions on Networking Johari, R., Tan, D., K.H. 2001; 6 (9): 818-832