Bright people are always welcome to join our team!


nextnano team
Stefan Birner

Dr. Stefan Birner

Managing Director & Founder

Stefan studied Physics at the universities of Bayreuth (Germany), Exeter (UK), Ohio State (USA) and the Technische Universität München (Germany).
During his studies, he gained experience through internships at companies such as Infineon Technologies and Genius CAD-Software.

Stefan holds a Master of Physics degree from the University of Exeter and a PhD in Physics from the Technische Universität München where he worked at the Walter Schottky Institute in the field of Theoretical Semiconductor Physics under the supervision of Prof. Peter Vogl.

In October 2012 he founded the nextnano GmbH where he serves as the managing director since November 2012.



  • stefan.birner [at]
  • Dr. Stefan Birner
  • Stefan Birner's profile on LinkedIn


Dr. Thomas Grange

Research & Development

Thomas was born in France and studied Physics at the École normale supérieure de Lyon (ENS Lyon) and at the École normale supérieure (ENS), Paris. He holds a bachelor (License) and a master (Maîtrise) degree in Physics from ENS Lyon and a Master in Quantum Physics degree from the ENS, as well as a PhD in Physics from Université Paris VI (Université Pierre-et-Marie-Curie). His PhD work was on the theory of electron-phonon interaction, polaron formation and dynamics in quantum dots in the group of Robson Ferreira and Gérald Bastard at the ENS. During his studies, he spent a few months with Danny Segal at the Imperial College London (UK) and with Lu J. Sham at the University of California, San Diego (USA).

Before joining nextnano in 2017, he worked for 8 years as a Postdoc. Half of this time he spent with a Humboldt Research Fellowship at the Walter Schottky Institute of the Technische Universität München (Germany) in the group of Peter Vogl on the modeling of quantum cascade lasers. At the Institut Néel (CNRS) in Grenoble (France) he was working in the Nanophysics and Semiconductors group of Alexia Auffèves on modeling of quantum dots and nitrogen-vacancy centers in diamond.

At nextnano, Thomas is our expert on quantum cascade laser modeling using the non-equilibrium Green's function method.



  • thomas.grange [at]
  • Thomas Grange's profile on LinkedIn


Dr. Alex Trellakis

Research & Development

Alex was born in the Netherlands and has a profound knowledge in both Physics and Computer Science. He holds a master (Diplom) degree in Physics from Friedrich-Wilhelms Universität Bonn (Germany), and both a Master of Science in Physics and a Master of Computer Science degree from the University of Illinois at Urbana-Champaign (USA), as well as a PhD in Physics from the University of Illinois at Urbana-Champaign (USA). During his PhD he investigated computational approaches to silicon-based nanostructures in the group of Prof. Umberto Ravaioli.

After his graduation, Alex worked 1 year as Research Scientist at Science Applications International Corporation (USA) and 2 years as Senior TCAD Engineer at Intel Corporation (USA). Then, from 2002 to 2006, he worked as assistant professor at the Walter Schottky Institute of the Technische Universität München (Germany) in the group of Prof. Peter Vogl where he developed the nextnano++ software. Afterwards, Alex has been working for many years as software engineer for DrVis Software GmbH and as technical consultant in a patent law firm.

At nextnano, Alex is our expert on device physics, numerical methods and software engineering.


alex.trellakis [at]


Maria Cecilia da Silva Figueira

Research & Development and Customer Support

Maria was born in São Paulo, Brazil and holds a BSc degree in Physics, a MSc degree in Nuclear Physics and an Electrical Engineering degree, all from the Universidade de São Paulo, Brazil. Before joining nextnano she worked as a Digital Integrated Circuit Design Engineer for the Ministry of Science, Technology and Innovation of Brazil. At nextnano she is leading our LED, laser diode and nanotransistor modeling business and makes our users happy by answering their support questions.



maria.figueira [at]


Carola Burkl

Software Development

Carola holds a BSc degree in Engineering Physics from the Hochschule München. During her Bachelor thesis “Optimization of Terahertz Quantum Cascade Lasers – Numerical analysis of the Influence of Material Parameters on the Gain” she was using the nonequilibrium Green's function approach to simulate quantum transport in QCLs.
Currently she is studying towards a MSc degree in Micro- and Nanotechnology at the Hochschule München.
In 2012 she founded the school “Ecole Assokoto des Sourds” in Togo. If you want to support these activities, you can also contribute with a donation.

At nextnano, Carola is responsible for the nextnanomat graphical user interface.


carola.burkl [at]


Takuma Sato

Research & Development

Takuma was born in Japan and studied Physics at Tohoku University in Sendai, Japan. He holds a BSc degree in Physics from Tohoku University. Currently he is studying towards his MSc degree in Physics at Tohoku University where he is doing research on spintronics and thermodynamic cycles under the supervision of Prof. Gerrit E. W. Bauer in the Condensed Matter Theory group at the Institute for Materials Research.

At nextnano, he is doing an R&D internship via the 1-year program “Vulcanus in Europe 2019-2020” of the EU-Japan Centre for Industrial Cooperation.


takuma.sato [at]


Jörg Stratmann

Software Development

Jörg holds a Diplom degree in Computer Science from the University of Bonn, Germany.
During his diploma thesis at the University of Bonn he was working on robotics and artificial intelligence. Since 1999 he has been working as a software developer for a German television channel.

He works as a part-time employee for nextnano and as our cloud computing expert he is responsible for the integration of HTCondor, Azure and aws into our graphical user interface.


joerg.stratmann [at]


Kemal Öztas

Research & Development

Kemal was born in Istanbul, Turkey. He holds a BSc degree in Engineering Science from the Technische Universität München. He is currently studying Mathematics in Science and Engineering (MSc) at the Technische Universität München with a DAAD scholarship.


kemal.oeztas [at]



Max Falkowski

Software Development

Max was born in Ukraine and studied Physics at the Ludwig-Maximilians-Universität München (LMU). He holds a BSc and a MSc degree in Physics from LMU where he worked as an experimental physicist on low-dimensional semicondutor structures in the Quantum Transport group at the Chair of Solid State Physics.

Before joining nextnano in 2014, he worked at attocube systems AG. Currently he is studying towards his PhD degree.

now at Hochschule München, Germany


Zoltán Jéhn

Software Development

Zoltán was born in Hungary and holds a BSc degree in Theoretical Physics and a BSc degree in Chemical Engineering from the Budapest University of Technology and Economics (BME), and a MSc degree in Applied and Engineering Physics of the Technische Universität München.

In 2010 he won the gold medal and the special prize for the best experimental work, and in 2011 the bronze medal at the International Physics Olympiad (IPhO) in Zagreb (Kroatia) and Bangkok (Thailand), respectively. At the national level, he was 2nd (2010) and 5th (2011), respectively.

In 2017 he founded Xiences where he develops the XienceSim simulation software.
Currently he is studying towards his PhD degree.

now at Technische Universität Wien, Austria


Daryoush Nosraty Alamdary

Research & Development

Daryoush studied Electrical Engineering at the American University of Sharjah in the United Arab Emirates and Physics in both Vienna and Munich. He holds a BSc and a MSc degree in Physics from the University of Vienna, Austria.
During his master thesis at the University of Vienna he worked on (TD-)DFT simulations of electronic properties and plasmonics in 2D materials. Previously, he was working at the Fraunhofer Research Institution for Microsystems and Solid State Technologies EMFT in Munich.

now studying towards his MSc in Condensed Matter Physics at the Technische Universität München, Germany

Jonathan Becker

now at Microsoft Quantum Lab, Copenhagen, Denmark

Dr. Bernhard Mittermeier

now at RF360 Europe GmbH - A Qualcomm TDK Joint Venture, München, Germany

Dr. Dominik Nowatschin

now at PPI AG, Hamburg, Germany

Thomas Hofmann

now at msg life ag, München, Germany