Clemens Stachl

I am a postdoctoral researcher at the Media and Personality Lab (Gabriella Harari) at the Department of Communication at Stanford University.

I have a background in Psychology and specialize in the investigation of personality traits, individual differences, and human behavior with mobile-sensing methods. I use machine learning techniques to describe, explain, and predict psychological traits.

In particular, I investigate how computational methods and AI can be used to improve and facilitate peoples lives, how human-computer interaction can be improved by considering individual differences, and what consequences the widespread use of computational systems can have on individuals and society at large.

I am sometimes active on Twitter

News & Updates

Machine Learning workshop

25.08.2020, Online

I gave a online short-version of the Introduction to Machine Learning in R workshop (developed by myself and Florian Pargent)

USC - Summer School

04.08.2020, Online

I will be giving a talk on the predictiveness of behavioral smartphone data for personality traits, at the USC - summer school on Sensor-Based Behavioral Machine Learning

New articles out

Stachl, C., Au, Q., Schoedel, R., Samuel. D. Gosling, Gabriella. M. Harari., Buschek, D., Völkel, S., Schuwerk, T., . . . Bühner, M. (2020). Predicting Personality from Patterns of Behavior Collected with Smartphones. Proceedings of the National Academy of Sciences of the United States of America (PNAS).

Stachl, C., Pargent, F., Hilbert, S., Harari, G. M., Schoedel, R., Vaid, S., … Bühner, M. (2020). Personality Research and Assessment in the Era of Machine Learning. European Journal of Personality, per.2257.

Schoedel, R., Pargent, F., Au, Q., Völkel, S. T., Schuwerk, T., Bühner, M., & Stachl, C. (2020). To Challenge the Morning Lark and the Night Owl: Using Smartphone Sensing Data to Investigate Day–Night Behaviour Patterns. European Journal of Personality, per.2258.

Völkel, S. T., Schödel, R., Buschek, D., Stachl, C., Winterhalter, V., Bühner, M., & Hussmann, H. (2020). Developing a Personality Model for Speech-based Conversational Agents Using the Psycholexical Approach. Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems, 1–14.

Pre-Conference on Personality Dynamics, Processes, and Functioning

27.02.2020, New Orleans, LA, USA

I am organizing a symposium on "Big Data, Machine Learning and Mobile Sensing - New Directions in Personality Research", featuring Ramona Schödel (LMU-Munich, Psychology) and Poruz Khambatta (Stanford Business School).

December 2019

I am giving a guest lecture on personality sensing with smartphones in the human factors seminar of Ramona Schödel at Ludwig-Maximilians-Universität München.

Oktober 2019

I will start my new position and will join Gabriella M. Harari's team at the media and personality lab at Stanford University.

30.09.2019 - 02.10.2019

Uni-Saarland, Saarbrücken, Germany.

  1. . 30.09.2019. I will give a talk on the importance of interpretable machine learning for research and assessment in psychology.

  2. 02.10.2019, 18:30h. I will be participating in a panel discussion on explainable AI.

DPPD 2019, Dresden, Germany

14.09. - 18.09.2019

  1. 15.09.2019, 9:00-17h. Prior to the DPPD20199 conference, Ramona Schödel and I will provide "An Introduction to Machine Learning for Psychologists in R" in a preconference workshop. More infos are provided via this OSF-repository.

  2. 16.09.2019. For my work on the usage of smartphones for personality research and assessment, I was awarded with the "Award for Digital Assessment" by the Division for Personality and Psychological Assessment of the German Psychological Society (DGPS).

  3. 17.09.2019, 11:00h. I will be giving a presentation on "Machine Learning for Personality Assessment" at Le Vy Phan's symposium on Challenges in and Approaches to Behavioral Assessment & Prediction.

ECDP 2019


Presentation at the ECDP Big Data special event in Athens.

Together with Sabine Walper, I will talk about the potential of mobile sensing methods for continous high-frequent data collection in developmental psychology.


Presentation at the DPPD Post-Doc workshop at the GESIS institute in Mannheim.

I will present results from our teams latest study on the prediction of big five personality traits from a wide range of smartphone-sensed behaviors.



Presentation at the 1st workshop on mobile apps and sensors in surveys (MASS) at the University of Mannheim.

I will introduce the LMU-PhoneStudy mobile-sensing research system and presents how data from mobiles sensors can be used cojointly with classical measures from surveys.

SPSP 2019


Presentation at the 2019 SPSP Annual Convention.

I will give a(n) (unfortunately remotely) talk on the predictability of personality traits from every-day smartphone usage in the symposium "Using RealWorld Behavioral Data to Advance Psychological Research and Theory", chaired by Christine Anderl,


Machine Learning Workshop at the University of Regensburg

Florian Pargent and myself will be giving an introductory machine learning workshop at the University of Regensburg.

Check out our open materials and data:


Machine Learning Workshop at the University of Cologne

Florian Pargent and myself will be giving an introductory machine learning workshop at the University of Cologne.

Check out our open materials and data:

DGPS 2018

16.09. - 20.09.2018

  1. Prior to the DGPS2018 conference, Florian Pargent and I will provide "An Introduction to Machine Learning for Psychologists in R" in a preconference workshop. More infos will be provided via this OSF-repository.

  2. I'll be chairing a prediction-focused symposium ( "Predictions in Psychology - Behavior, Personality, Emotions, Performance, Places and Person-Culture Fit") at the DGPS2018 in Frankfurt, Germany.

  3. Prof. Dr. Markus Bühner and I will discuss "Psychological Diagnostics in the Era of Machine Learning" in the invited symposium "Big Data: The new Big Promise for research in applied psychology?", chaired by Cornelius König.


GESIS - CSS Seminar

Claudia Wagner has invited me to present my research about mobile sensing at the GESIS CSS seminar for computational social science in Cologne.

24.08. - 27.08.2018

CLC Workshop

Gabriella M. Harari and Samuel D. Gosling have invited me to participate in an initial workshop for the creation of an international mobile sensing consortium in Austin, TX, USA.

ECP 2019

17.07. - 21.07.2018

Together with Sandrine Müller, I'll be chairing a symposium titled "Quantified Personality: Measuring individual differences in behavior with mobile sensing"at the ECP19 in Zadar, Croatia and present my latest work on the prediction of behavior from digital footprints.

APS 2018


Sandrine Müller and I be will co-chairing a symposium titled "Physical manifestations of psychological characteristics" at the APS - Convention in San Francisco. I will present my groups work on the prediction of individual personality traits from smartphone data with a focus on geo-location based features.


Invited Talk, Stanford University

Jon Krosnick and Gabriella Harari have invited me to give a talk about mobile sensing research at the communications department of Stanford University.