Ph.D. Students

Farzin Ahmadi

PH.D. STUDENT

Advisor: Prof. Kimia Ghobadi

Farzin is a PhD student of the Department of Civil and Systems Engineering (CaSE), the Center for Systems Science and Engineering (CSSE) at the Johns Hopkins University, and the Malone Center for Engineering in Healthcare at Johns Hopkins University. His research is focused on data-driven constrained inference models and their applications in healthcare. His recent work includes providing optimal models for hospital occupancy management during the COVID-19 pandemic and data-driven optimized models for health-care decision making processes.

  • Decision Making in Healthcare
  • Inverse Optimization and its applications on Healthcare
  • Optimizations and Simulations
  • Machine Learning Approaches to big data applications in Radiation Therapy

Chia-Hsiu Chang

PH.D. STUDENT

Advisor: Prof. Takeru Igusa

Nimeesha Chan

PH.D. STUDENT

Advisor: Prof. Kimia Ghobadi

Meibin Chen

PH.D. STUDENT

Advisor: Prof. Takeru Igusa

Zhixi Chen

PH.D. STUDENT

Advisor: Prof. Takeru Igusa

Ensheng Dong

PH.D. STUDENT

Advisor: Prof. Lauren Gardner​

Ensheng (Frank) is a PhD student of the Department of Civil and Systems Engineering (CaSE), the Center for Systems Science and Engineering (CSSE) at the Johns Hopkins University, and the infectious disease dynamics (IDD) group at the JHU Bloomberg School of Public Health. He is interested in interdisciplinary research on network science, mobility modeling, machine learning, spatial analysis and visualization, and infectious disease. His recent work includes forecasting measles risk in the US and the Pacific Island Countries and Territories (PICTs), visualizing and modeling the novel coronavirus (COVID-19), and predicting dengue outbreaks in Sri Lanka.

  • Network Modeling
  • Spatial Visualization
  • Infectious Disease

Hongru Du

PH.D. STUDENT

Advisor: Prof. Lauren Gardner​

Fardin Ganjkhanloo

PH.D. STUDENT

Advisor: Prof. Kimia Ghobadi

Nathaniel Gordon

PH.D. STUDENT

Advisor: Prof. Gregory Falco

Iliana Maifeld-Carucci

PH.D. STUDENT

Advisor: Prof. Gregory Falco

Matty Golub

PH.D. STUDENT

Advisor: Prof. Takeru Igusa

Wanyu Huang

PH.D. STUDENT

Advisor: Prof. Takeru Igusa

Max Marshall

PH.D. STUDENT

Advisor: Prof. Lauren Gardner​

Kristen Nixon

PH.D. STUDENT

Advisor: Prof. Lauren Gardner​

Fayo Ojo

PH.D. STUDENT

Advisor: Prof. Takeru Igusa

Jing Liu

PH.D. STUDENT

Advisor: Prof. Kimia Ghobadi

Felix Parker

PH.D. STUDENT

Advisor: Prof. Kimia Ghobadi

Sonia Jindal

PH.D. STUDENT

Advisor: Prof. Lauren Gardner​

Marietta Squire

PH.D. STUDENT

Advisor: Prof. Takeru Igusa

Marietta Squire is a PhD student that works with the Center for Systems Science and Engineering (CSSE) in the Department of Civil and Systems Engineering (CaSE) at Johns Hopkins University. She applies systems dynamics and mathematical optimization techniques to assess how to allocate budgets and various resources in a healthcare setting. She also applies mathematical modeling to assess how to bolster patient safety in healthcare. This is applied in order to minimize the transmission of healthcare-associated infections (HAIs) within a hospital setting.

She also works with Epidemiology and Infection Control and Prevention teams to quantify the risk of secondary infections at the hospital unit level. This risk quantification can then be used by Infectious Prevention teams in hospitals to inform and serve as a decision support tool to assist in the allocation of infection prevention resources.

  • Systems Dynamics
  • Healthcare Economics
  • Optimizing Decision Making in Healthcare
  • Decision Support in Assessing Risk
  • Modeling Hospital Energy and Economic Costs for COVID-19 Infection Control Interventions
    Quantifies the energy impact of the application of negative pressured treatment rooms and xenon ultraviolet light decontamination, as well as the reduction in secondary COVID-19 infections, in a hospital setting.
    Paper:
    https://www.medrxiv.org/content/10.1101/2020.08.21.20178855v1
  • Optimal Design to Mitigate Multidrug-Resistant Organisms in Acute Care and Community Hospitals
    Applies clinical data from multiple hospitals and MDRO infection treatment cost (from 400 facilities for MRSA) in order to assess which hospital infrastructure infection control measures best enhance patient safety. The model is externally validated against clinical data from multiple years and patient admission data.
    Paper: https://journals.sagepub.com/doi/abs/10.1177/1937586720976585#abstract
  • Cost-Effectiveness of Multifaceted Built Environment Interventions for Reducing Transmission of Pathogenic Bacteria in Healthcare Facilities
    Cost-Effectiveness Analysis of Infection prevention intervention-pairs for mitigating the transmission of multidrug-resistant organisms (methicillin-resistance, carbapenem-resistance, vancomycin-resistance)
    Paper:
    https://journals.sagepub.com/doi/10.1177/1937586719833360

Siyao Zhu

PH.D. STUDENT

Advisor: Prof. Takeru Igusa

Post-docs and Researchers

Hamada Badr

Assoc. Research Scientist

Team: Prof. Lauren Gardner​

Today, there are many skilled and talented research scientists working across industry and applying their abilities to solve challenging problems of their field. It is rare, however, to find a scientist who dynamically combines multiple disciplines (interdisciplinary research), innovative ideas and software approaches to solve complex real-world problems using (big) data analytics and numerical simulations. I am a data scientist with broad and in-depth skills and more than two decades of experience in statistical analysis, numerical modeling of physical processes, data visualization, and software development as well as project management and leadership. I am a software-independent developer who can easily and quickly switch between different platforms and master new solutions. I am trained first in aerospace engineering and earth sciences, and I have developed my skills in programming, mathematics, statistics, and physics to address grand challenges in aerodynamics, hydroclimate, drought monitoring and early warning, food and water security, and global health.

  • Machine Learning & Artificial Intelligence
  • Spatiotemporal Analysis of Hydroclimate Variability
  • Multiscale Hydroclimate Dynamics & Change
  • Satellite Remote Sensing & Earth Observation
  • Numerical Modeling & Data Assimilation
  • Dynamical & Statistical Downscaling
  • Numerical Weather Prediction (NWP)
  • Computational Fluid Dynamics (CFD)
  • High Performance Computing (HPC)
  • Applications of Big Data in Real Life Problems

Jeremy Ratcliff

Adjunct Assistant Research Scientist

Team: Prof. Lauren Gardner​

Jeremy is a PhD candidate in the Nuffield Department of Medicine at the University of Oxford funded by a Marshall Scholarship and a researcher at the Johns Hopkins University Applied Physics Laboratory (JHU/APL). His doctoral research focuses on rapid identification and characterization of emerging viral pathogens using clinical and genomic methods and his work with JHU/APL supports the CSSE COVID-19 Dashboard. His research interests span many aspects of pandemic science and he is particularly interested in combining multiple data streams to better detect, predict, and prevent infectious disease transmission.

  • Molecular Diagnostics and Next-Generation Sequencing
  • Infectious Disease Dynamics
  • Phylogenetics and Phylodynamics
  • Epidemiology

Alumni

Ying Zhang

Research Associate
Joint Global Change Research Institute

Teams: Prof. Lauren Gardner & Prof. Lauren Gardner

Charalampos Avraam

Smart Cities Postdoctoral Associate
New York University

Advisor: Prof. Sauleh Siddiqui

Charalampos is a PhD Candidate at the Department of Civil and Systems Engineering at the Johns Hopkins University, affiliated with the Center for Systems Science and Engineering (CSSE), the Mathematical Optimization for Decisions Lab (MODL), the Networked Dynamical Systems Lab (NetDyLab), and an A.G. Leventis Foundation scholar. Charalampos employs optimization-based tools and control theory to study the impact of climate change, resource availability, and renewable policies on networked food and energy infrastructures.

  • Bilevel Optimization
  • Control Theory
  • Food-Energy-Water infrastructure development
  • Power Systems

Qi Wang​

Advisor: Prof. Takeru Igusa

Mascot (CCO)

TimTam

chief cuteness officer