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Students & Postdocs

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Sung Yul ChuSung Yul Chu grew up in Seoul, South Korea and received his Bachelor’s and Master’s Degrees in Electrical & Electronic Engineering from Yonsei University in South Korea in 2009 and 2011, respectively. His master’s work focused on the design and manufacturing of superconducting magnets. Before joining University of Michigan, he was an assistant Engineer-HW for smart phones at Samsung Electronics, Suwon, South Korea (2013) and a junior research engineer for automotive sensor’s digital circuit at Hyundai Kefico, Gunpo, South Korea (2014-2016).

He is currently pursuing a PhD at the University of Michigan working with Prof. Al-Thaddeus Avestruz. His current interests involve the wireless power transfer, power measurements and its coil design. 

To contact Sung Yul, please send an e-mail to 
Stephanie CrockerStephanie Crocker hails from Poughkeepsie, NY. She went to Dartmouth College in Hanover, NH for her undergraduate studies. While there she volunteered for Dartmouth Humanitarian Engineering and spent 10 weeks in Tanzania working on a project to improve the efficiency of wood burning cook-stoves. In her senior year she discovered a love of power electronics, which led her to pursue an entry level position at FINsix, a startup focused on shrinking the “power brick” (i.e. the laptop charger). After a year and a half “break” from school, Stephanie came to Michigan to work with Prof. Johanna Mathieu on controlling thermostatic loads for use in automatic demand response programs.  Her current research focuses on the determining the impact on the distribution power system’s physical constraints when thousands of thermostatic loads are being coordinated by an aggregator.

Stephanie is an outdoor enthusiast, and likes to bike, kayak, and cross-country ski. Around Ann Arbor her favorite spots are the Nichols Arboretum, the Bridge-to-Bridge bike trail along the Huron River, and Pinckney State Rec. Area.
Xiaofan CuiXiaofan Cui was born in Xian, Shaanxi, China. He received his bachelor’s degree in Electrical Engineering and Automation from Tsinghua University in 2016. His undergraduate work includes electromagnetic field measurement, mechanical design, and high performance power electronics circuits design. He is now in Professor Al Avestruz’s group and studying for a PhD degree at the University of Michigan in Ann Arbor. His main research interests involve solar energy circuits analysis. To contact Xiaofan, please email
Sijia GengSijia Geng received her bachelor’s degree in Automation from Harbin Institute of Technology in 2016. During her undergraduate studies, she worked as research assistant in the Research Institute of Intelligent Control and System. Sijia also did an exchange study to the Purdue University in her senior year. After graduation, she joined the Michigan Power and Energy Laboratory at the University of Michigan working with Prof. Ian Hiskens. Her research interests include nonlinear and hybrid system analysis, second-order trajectory sensitivity analysis, microgrids control and optimization, and renewable energy resources. Sijia desires to apply her research to the real world in the hope of uplifting the whole people. During her free time, she enjoys playing piano and traveling. Sijia is also the membership chair of GradSWE at UM since 2017. Contact:
Ioanni Marios (Giannis) Granitsas grew up in Athens, Greece. He received his Diploma in Electrical and Computer Engineering from the National Technical University of Athens (NTUA) in 2017. Afterwards, he worked for a year as a research assistant under the supervision of Prof. Costas Vournas at the Laboratory of Electric Power Systems (ECE NTUA), examining the effect of wind farm stochastic power variability on the voltage stability support to the Hellenic Interconnected System.  Before joining the University of Michigan, he took up a 5-month internship as an energy analyst at Eunice Energy Group located in Athens, where he contributed in the analysis of the energy market in order to find import or export opportunities. 

Giannis joined the University of Michigan in 2019 and is currently pursuing his PhD in Electrical Engineering, working as a Research Assistant at the Michigan Power and Energy Laboratory, under the supervision of Prof. Ian Hiskens and Prof. Johanna Mathieu. His research interests include the use of stochastic methods, optimization and data analysis in order to cope with the increasing uncertainty introduced by renewable energy sources in electric power systems and energy markets. To contact Giannis please email
Sunho JangSunho Jang grew up in Seoul, South Korea and earned his B.S. degree in Electrical & Computer Engineering from Seoul National University in 2019. In 2017, he worked as a research intern in Naver Labs Robotics Laboratory in which he participated in a project developing a social robot for children. During the last year of his undergraduate, he was an intern in the Control and Optimization Research Laboratory (CORE Lab) in Seoul National University, and conducted research on an optimization algorithm for dynamic programming to solve a stochastic optimal control problem. He is now pursuing his Ph.D. at the University of Michigan under Prof. Johanna Mathieu and Prof. Necmiye Ozay. His current research focuses on developing a scalable optimal control algorithm for a collection of many systems with constraints, especially for power systems.
Jonas KersulisJonas Kersulis grew up near Saint Louis, Missouri. Fascinated by the logic of circuits, he enrolled in the University of Missouri-St. Louis/Washington University Joint Undergraduate Electrical Engineering Program in 2009. During his junior year, Jonas was hired as a sound lab technician for Nidec Motor Corporation. There he gained an appreciation for electric motor dynamics, washing machine acoustics, and the plurality of ball bearing failure modes. Upon graduation with a B.S.E.E. degree in 2013, Jonas joined Michigan’s Electrical Engineering:Systems PhD program to work with Dr. Ian Hiskens. In summer 2014 Jonas joined the US Department of Energy’s Grid Science Program by working at Los Alamos National Laboratory’s Center for Nonlinear Studies. 

Jonas is interested in applying mathematical programming to power system problems. He is currently exploring the effects of wind variability on transmission networks. Jonas is also using computational tools to bring new interactivity to numerical experimentation and power system visualization.
Greg LedvaGreg Ledva received his bachelor’s degree in Mechanical Engineering from Penn State before pursuing a master’s degree in the MEST program at ETH Zurich. During his time in Zurich, he found an interest in power systems and research, and he is now working with Dr. Mathieu while working towards his PhD at the University Michigan. His research interests include developing control algorithms that reduce communication and sensing requirements in demand response programs and adapting machine learning methods to control techniques. His other interests include travelling, watching football, playing rugby, and enjoying the outdoors while kayaking, paddle boarding, and fishing. To contact Greg, please email
Md Salman NazirMd Salman Nazir is originally from Bangladesh. Salman received the B.Eng. (Honours) and M.Eng. (Thesis) degree, both in Electrical Engineering, from McGill University, Montreal, QC in 2011 and 2015, respectively. His undergraduate thesis involved applying game theory to study the strategic behavior of generators in electricity markets and his master’s thesis involved modeling power systems scheduling applications for systems with significant wind energy. During 2012-2014, he was a smart grid engineer at the CanmetENERGY laboratory of Natural Resources Canada, where he worked on developing control algorithms for integration of distributed energy resources into the power grid. 

Salman is currently a Ph.D. student at University of Michigan. His research interests include operations, control and economics of power systems at presence of significant renewable and distributed energy resources. Contact:
Oluwagbemileke Oyefeso hails from Lagos, Nigeria where he obtained his Bachelor’s degree in Electrical and Electronics Engineering from the University of Lagos. His undergraduate thesis was on the “Local Production and Utilization of Solar Panels in Nigeria”. Prior to joining the University of Michigan, Gbemileke worked with Ariosh Limited as an Instrumentation and Control Engineer where he contributed greatly to the Front End and Detailed Engineering Design of various oil & gas projects.

He is currently pursuing his PhD at the University of Michigan, in Electrical and Computer Engineering, with Control Systems as his Major. His research interests span across Industrial Process Control and Automation, Renewable Energy and Load Control. Gbemileke currently works with Prof. Johanna Mathieu and Prof. Ian Hiskens on overcoming the technical challenges associated with load control at scale.

Read more about Oluwagbemileke’s professional background on LinkedIn.
Reach out to Oluwagbemileke at    
Jing PengJing Peng is from Yunnan, China. She received her Bachelor’s degree in Environmental System Engineering from Penn State University and a Master’s degree in Environmental Management and Economics from Johns Hopkins University (JHU). While at JHU, she became interested in energy system modeling and energy policies, and conducted research on the impacts of carbon policies on power system planning and the environment. Currently, Jing is pursuing her Ph.D. degree in the department of Electrical Engineering and Computer Science at the University of Michigan with Prof. Johanna Mathieu. Her current research interests include power system optimization and power markets analysis. To contact Jing, please email
Ziyou SongZiyou Song’s interests include optimization, control, modeling, and estimation of electrical powertrain for electric, hybrid electric, and plug-in hybrid electric vehicles. In recent years, he mainly focused on the optimization and control of the battery-supercapacitor hybrid energy storage system (HESS), which has been widely used in PHEV applications. In previous publications, he showed that the energy management strategy and the component sizing of HESS should be optimized simultaneously to reduce the battery degradation and increase the system efficiency. Different HESS configurations were also compared based on the dynamic battery degradation model. Furthermore, a sliding-mode current controller and a Lyapunov function-based voltage controller were proposed to accurately control the battery/supercapacitor currents and bus voltage. For now, he works with Professor Heath Hofmann on the adaptive energy management strategy, which can be used in HESS when its parameters significantly change. In addition, he also cooperates with Professors Minggao Ouyang and Jianqiu Li in Tsinghua University to deal with the network time-delay problem in distributed electric vehicles. To contact Ziyou, please email
Anna StuhlmacherAnna Stuhlmacher received her bachelors of science from Boston University in Electrical Engineering. Currently, she is pursuing a PhD degree at the University of Michigan with Prof. Johanna Mathieu. Anna’s current research focuses on creating an optimal urban water distribution algorithm that is spatio-temporally responsive to the electricity distribution network’s locational marginal prices, while meeting the consumers’ demands. By coupling these networks, the water distribution network would no longer be a passive load on the electricity network. She is originally from the western suburbs of Chicago. In her free-time, Anna likes hiking, biking, ice cream, and playing badminton. To contact Anna, please email
Yuanying Wang is from Chengdu, China, the sweet home for giant pandas and hotpot. She received her bachelor’s degree in Electrical Engineering and Automation at Huazhong University of Science and Technology, Wuhan, China in 2014, and master’s degree in Control and Signal Processing at University of Michigan in 2016. She is currently pursuing her PhD degree at University of Michigan in Prof. Heath Hofmann’ research group. Her research focuses on computational thermal analysis and thermal modeling of electric machines. Yuanying loves playing badminton and piano in her spare time. To contact:
Mengqi Yao was born in Hunan, China. Under the influence of her parents who both have a solid academic background in the field of electrical engineering, her initial interest in Electrical Engineering was ignited at very young age. She earned her Bachelor’s Degree in Electric Power Engineering & Automation from Shanghai Jiao Tong University in 2014, and in 2016 she received her Master’s Degree in Electrical Engineering (Power & Energy) from the University of Michigan. She is currently pursuing a Ph.D. at U of M, working with Prof. Johanna Mathieu. Her research interests include demand response effect on power system stability and development of methods to evaluate and improve electric power system stability margins. Contact:
Xin ZanXin Zan grew up in Qinghai – Tibet Plateau, the Third Pole of the world. He received his bachelor’s degree in Electrical Engineering and Automation from Tsinghua University, China in 2016. During his undergraduate studies, he made progress in the fields of electromagnetics and the application of information theory in power systems. He also focused on power electronics and his undergraduate thesis is Modeling of IEGT and Loss Simulation of Its Converters.Xin ZAN is currently pursuing a Ph.D. degree with Prof. Al-Thaddeus Avestruz. His interests are power electronics, renewable energy, circuit design and control. Outside of work, Xin enjoys sports, travel, movies and cooking. To contact Xin, please email him at