About Us


John Johnson
Senior Director
Room 4490, Global Hub


John joined Kellogg in 2016. He has served in numerous roles at the intersection of economics, mathematical modeling, and technology, including most recently as the founding director of the Research Support unit at the Stanford Graduate School of Business. His areas of expertise include novel data collection, text-based data transformation and analysis, large scale data systems, design thinking, and talent development.

As Senior Director, he oversees the entire Research Support unit at Kellogg, including the ongoing development of new capabilities and services that the team offers. John earned an MA (ABD) in Economics from Stanford University.
Yekaterina Sigalova
Yekaterina Sigalova
Associate Director
Room 357, Jacobs Center


Kat joined the team in 2017 to lead behavioral research support for Kellogg. Kat has several years' of behavioral research experience, including roles in regulatory affairs and Institutional Review Board (IRB) administration. Her areas of expertise include systemic change management, process improvement, and human research protections.

As Associate Director, she leads our efforts to improve and expand support for experimental research at Kellogg. This includes increasing subject pool volume and diversity, improving efficiency and effectiveness of lab operations, and ensuring compliance with federal and institutional research regulations.

Kat earned a BS in Human Development and Psychological Services followed by a MA in Counseling Psychology, both from Northwestern University.

Mac Abruzzo
Behavioral Lab Manager
Room 370A, Global Hub

Mac joined Kellogg in 2017. As Behavioral Lab Manager, he provides logistical support for online and in-person behavioral research conducted at Kellogg. Mac partners with Kellogg behavioral research faculty and graduate students to develop and deploy behavioral experiments using innovative approaches and software platforms such as Inquisit, z-Tree/o-Tree, PsychoPy, and many more. Following experimental execution, Mac assists with data management, analysis, and financial operations.

Mac earned a BA in Psychology from Stanford University. His research interests are in the fields of intergroup communication and conflict.

 Jie (Jay) Cao
Senior Research Associate
Room 358, Jacobs Center 


Jie (Jay) Cao joined Kellogg in 2015. As Senior Research Associate, he works to manage and document research data and consult on software packages for statistical and numerical analysis.

Jay earned his PhD in Economics from the University of Toronto. His research interests are in the fields of macroeconomics, growth and development, and labor.

Maja Kos
Senior Academic Editor and Translation Manager
Room 4219, Jacobs Center


Maja Kos joined Kellogg in 2003. As Senior Academic Editor and Translation Manager, she provides editing support to tenure-line faculty. She also serves as the copy editor for Kellogg Insight and manages the translation of Insight articles for a global audience.

In addition to her work at Kellogg, Maja is a freelance editor and translator, specializing in the fields of medicine and economics. Her working languages include English, Croatian, and French.

Maja earned her BA in French Language and Literature from Boston College. During her undergraduate studies, she spent one year at the Sorbonne Nouvelle in Paris. She earned her MA in French Translation from the Middlebury Institute of International Studies at Monterey.
Frank Limbrock
Senior Research Associate
Room 3495, Global Hub


Frank Limbrock joined Kellogg in 2010. He is an applied microeconomist whose research focuses on health economics and industrial organization. His recent projects have examined the role of non-pecuniary incentives in prescription-drug choice and substitution between branded and generic drugs. Frank holds a PhD in Economics from Yale University, an MSc from the London School of Economics, and a Diploma from the University of Cologne.
Steve Tarzia
Senior Computational Research Consultant
Room 4350, Global Hub

Steve joined Kellogg in 2017. As Senior Computational Research Consultant, he helps faculty and PhD students overcome computational barriers in their research. He assists with gathering new data sets from the web, visualizing data, crowdsourcing or outsourcing repetitive tasks, speeding up or parallelizing code, making use of supercomputing resources like Northwestern's Quest, automating tasks with Machine Learning, analyzing texts, solving optimization problems, and more. 

Steve earned his PhD in the Computer Engineering and Systems division of the Electrical Engineering and Computer Science Department at Northwestern.  Prior to joining Kellogg, he worked at several software startups in Chicago.