The Rational Think Tank is composed of a diverse network of practitioners and students with a shared vision and a passion for Rational Thinking. A core team of six members currently serves as the Management Board, which is further supported by the Advisory Board.


Management Board

RTT-10 Philip J. Hattemer


Although Philip is a fourth-year law student, he has over nine months experience working for big law firms. These professional activities led him through the fields of M&A, capital markets, antitrust, litigation and restructuring. At Bucerius Law School, Philip is engaged in the revitalization process of Roman Herzog Inn, a local chapter of the legal honor society Phi Delta Phi – currently serving as Exchequer for the newly formed board. His legal studies include a semester abroad at Bar-Ilan University, Israel. Philip specializes in tax law.

Philip’s interest for cognitive sciences mainly derives from the intricate understanding of the human subconscious he acquired when he underwent training to become a personality coach and attended courses in neurolinguistic programming.

Asked about the impacts of applied rationality on the legal field, he posits: “This is the next, maybe the first, true disruption of the legal field. It affects all kind of legal professionals, right now, years before legal tech ripens to become a powerful technology. Rationality and congitive science provide a serious advantage for those who study these fields over those who don’t – it helps us in our personal life as well as in our professional life.”

Mail: philip.hattemer(at)

 RTT-8 Julian Grabiger 

Vice Chairman

Julian Grabiger has been working for several years as a Strategic Planner at Euro RSCG, one of the largest integrated marketing communications agencies in the world. He was responsible for targeted advertising campaigns and part of the business development branch. Previously, he was employed as a Consultant specialized for IT and digitization strategies with the German-Romanian consultancy firm Metromind, where he led a wide variety of multi-national projects. He has a professional degree as Specialist for Marketing Communication, a B.A. in International Management and a Master of Law and Business from Bucerius Law School. He is currently pursuing his doctoral studies in the fields of Legal- and FinTech.

RTT-4 Sinan Krückeberg 

Chief Strategy Officer

Besides his position as board member to his family’s business and general partner of the family office, Sinan is a PhD candidate at Claussen Simon Graduate Center at HSBA and research associate at the department of Finance & Banking. He holds a vocational degree in banking as well as an M.Sc. from King’s College London, specialising in Behavioral Finance throughout his academic career. Having been an entrepreneur in Berlin and Hong Kong, Sinan is especially interested in the complexities of societies, politics and economies, as well as biological organisms. He is a member of Die Familienunternehmer and Friedrich A. von Hayek Gesellschaft.

 Tim Weckmar Tim Weckmar

Chief of Staff

Tim is a fourth-year law student at Bucerius Law School. He has been engaged in volunteer work in the field of interdisciplinary studies for a literature society in his hometown for more than three years. Tim was inter alia the secretary of the ChampionsTrophy, an annual sports tournament for over 1.000 students from all over Europe. Executing such large-scale events successfully has provided Tim with the experience necessary to take care of the Rational Think Tank’s member base, local groups as well as corporative members. Tim is ensuring smooth productivity and collaboration within the organization, always having an open ear and supportive hands for the sub-entities of the Rational Think Tank.

  Rebecca Schlottmann 


Before starting to study law at Bucerius Law School, Rebecca completed her vocational training in the finance industry, to obtain a professional degree in banking. She gained valuable experience in funding and financial coordination of organizations during her first year of university. Rebecca is head of finances, always ensuring transparent and compliant financial analysis and reporting. Her interest for Rational Thinking was aroused during a lecture in macroeconomics, which she chose to pursue further and share with likeminded rationalists via the Rational Think Tank’s different forums.

 RTT-6 Florian Zink

General Secretary

Florian Zink is in his fourth year at Bucerius Law School. The year before university, he completed his A-levels. He is passionate about fitness and enjoys debating with friends and fellow students. Quite recently, he learned about Rational Thinking and from that moment it became something he wants to learn more about and get people involved in.