We are Sigma Squared.

Sigma Squared Society is a global community of 1000+ entrepreneurs who are on a mission to transform broken industries and create positive impact. With a presence across five continents and 25+ countries, our mission is to identify and empower the next generation of leaders by providing them with access to like-minded founders, investors, mentors, partners and events.

The Sigma Squared Society was previously known as the Kairos Society which started in the United States more than 13 years ago in 2008. Sigma Squared launched as a new organization following Kairos Society’s decision to focus on their new fund and to sunset their fellowship program. Sigma Squared Society plans to remain in close partnership with the Kairos Society and to keep the origins of Kairos Society strong and intact.

The minds behind
Sigma Squared.

Steering committee

Emanuel Joebstl

Community Director

Julia Zhou

Communications Director

Sebastian Becker

Investment Relations Director

Marketing team

Elena Tringali

Marketing Deputy Director

Ariel Kramer

External Communications Director

Julia Schmedding

Social Media Manager

Miray Ayyildiz

Content Creator

Summit team

Greta Pappa

Co-Managing Director

Johannes Oster

Co-Managing Director

Aleksandra Reinert

Communications & Marketing Lead

Ivan Garcia

Volunteers Lead

Investment relations

Lin Liu

Investment Relations Manager

Greta Pappa

Investment Relations Manager

Country executives

Danilo Mirabile

Italy (Sicily)

Frederic Tausch

Germany (Karlsruhe)

Vaitea Cowan

Germany (Berlin)

Max Elster

Germany (Cologne)

Stephan Schmidbauer

Germany (Munich)

Anjali Agarwal


Dorina Döring


Severin Ruoff



David Rowan

Founding Editor-in-Chief at WIRED UK

Xavier Sarras

Founding Partner of 4P Capital

Ricardo Marvao

Founder of beta-i

Nikolaus Widmann

Managing Director at inewa