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Investment Team

Janna Sampson, CFA Photo Janna Sampson, CFA Hover Photo
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Janna Sampson, CFA

Co-CIO and Managing Member

Janna Sampson, CFA

Co-CIO and Managing Member


Janna is responsible for research, stock selection and portfolio construction related to the firm's investment strategies. She is a founding member of OakBrook, the majority shareholder, a member of the firm's Management Committee and on the Investment team for all strategies. 

Prior to launching OakBrook, Janna was VP & Senior Portfolio Manager for ANB Investment Management & Trust Company. In addition to her active involvement in managing assets for both the Select Equity and Enhanced Index strategies, she was responsible for ANB's Balance Plus product line and an actively managed international equity mutual fund. 

Janna holds a BA in Economics and Political Science from University of Denver and an MA in Economics from Georgia State University.

Peter Jankovskis, PhD, CFA Photo Peter Jankovskis, PhD, CFA Hover Photo
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Peter Jankovskis, PhD, CFA

Co-CIO and Managing Member

Peter Jankovskis, PhD, CFA

Co-CIO and Managing Member


Peter is responsible for research, stock selection and portfolio construction related to the firm's investment strategies. He is a founding member of OakBrook, a significant shareholder, a member of the firm's Management Committee and on the Investment team for all strategies. 

Prior to launching OakBrook, Peter was Head of Research for ANB Investment Management & Trust Company. At ANB, Peter was actively involved in the management of the Select Equity style and an actively managed international equity mutual fund, the development of the quantitative model used for enhanced indexing and research in support of other investment strategies.   

Peter received BS degrees, summa cum laude, in Computer Science and Mathematics, as well as his MA and PhD in Economics from University of California, Santa Barbara.

 Giri Cherukuri, CFA Photo  Giri Cherukuri, CFA Hover Photo
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Giri Cherukuri, CFA

Head Trader and Portfolio Manager

Giri Cherukuri, CFA

Head Trader and Portfolio Manager


Giri is responsible for the execution of trades for all of OakBrook's strategies. He is a shareholder, a member of the firm's Management Committee and on the Investment team for all strategies. He joined OakBrook shortly after its launch and has worked with OakBrook's principals since 1994.

Prior to joining OakBrook in 1998, Giri was Investment Strategist at ANB Investment Management & Trust Company. At ANB, he helped develop new investment strategies and manage index portfolios. Before joining ANB in 1992, Giri was a Data Analyst at Morningstar.

Giri received a BA in Economics, with honors, as well as his MBA, from the University of Chicago.


Paula Mikrut, CFA Photo Paula Mikrut, CFA Hover Photo
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Paula Mikrut, CFA

Sr. Researcher and Portfolio Manager

Paula Mikrut, CFA

Sr. Researcher and Portfolio Manager


Paula is responsible for investment research for both Quantitative and Select Equity strategies. She manages software development for research projects on current and new investment strategies. She is a portfolio manager, a member of the firm's Management Committee and a member of the Investment Management team for all strategies.

Prior to joining OakBrook in 2010, Paula worked in management and product development for a variety of high‐technology companies. She also owned a software development company.

Paula has an MBA from the University of Chicago, an MS in Computational Finance from DePaul University, and an MS in Computer Science from the University of Wisconsin‐Madison.

Tolga Guder, CFA Photo Tolga Guder, CFA Hover Photo
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Tolga Guder, CFA

Research Analyst

Tolga Guder, CFA

Research Analyst


Tolga provides support to portfolio managers, primarily focusing on equity research and idea generation. Tolga is on the Investment team for all strategies. 

Prior to joining OakBrook in 2016, Tolga was a Senior Analyst at Northern Trust.

Tolga received a BS in Economics from DePaul University and a Post‐Baccalaureate certificate in Finance from Northwestern University.