I am an Assistant Professor with the University of Amsterdam, conducting research at the intersection of data management and machine learning. I manage the AI for Retail Lab Amsterdam, and have a joint appointment as Research Fellow at Ahold Delhaize, an international retailer based in the Netherlands.

My work covers many aspects, such as automating data quality validation, optimizing programs that combine operations from linear and relational algebra or tracking the lineage of machine learning pipelines.

In the past, I have been a Faculty Fellow with the Center for Data Science at New York University and a Senior Applied Scientist at Amazon Research, after obtaining my Ph.D. at the database group of TU Berlin with Volker Markl. I am active in open source as an elected member of the Apache Software Foundation, and have extensive experience in building real world systems from my time at Amazon, Twitter, IBM Research, and Zalando.

• Our paper summarizing the Apache Mahout project called Apache Mahout: Machine Learning on Distributed Dataflow Systems has been accepted to the open source track of JMLR.

• I gave a talk on Unit Tests for Data with Deequ at the database group of CWI, checkout the video here.

• We ran the 4th edition of the Workshop on Data Management for End-to-End Machine Learning (DEEM) with more than 120 attendees via Zoom this year. Checkout the videos of the presentations and invited talks on our website.

• I will give a keynote on Making Production Machine Learning Robust to Data Errors at the Castor Software Days at KTH Stockholm in October.

• SIGMOD’20: We presented a paper on Learning to Validate the Predictions of Black Box Classifiers on Unseen Data accepted, an industry paper on Elastic Machine Learning Algorithms in Amazon SageMaker, as well as initial ideas on the Fairness-Aware Instrumentation of Preprocessing Pipelines for Machine Learning in the Human-in-the-Loop-Data-Analytics workshop.

• CIDR’20: We presented our work on “Amnesia” - A Selection of Machine Learning Models That Can Forget User Data Very Fast.

• EDBT’20: We presented a short paper on FairPrep: Promoting Data to a First-Class Citizen in Studies on Fairness-Enhancing Interventions and a full paper on Zooming Out on an Evolving Graph.

• Our work on scalable data validation has been integrated into the new Amazon SageMaker Model Monitor service for concept drift detection. Here is the announcement at the AWS Reinvent conference:
  
  

• Our paper on Datawig: Missing Value Imputation for Tables has been accepted at the open source track of the Journal of Machine Learning Research (JMLR).

I am part of the Information and Language Processing Systems group led by Maarten de Rijke and the Intelligent Data Engineering Lab led by Paul Groth.

PhD Students

Mozhdeh Ariannezhad (co-supervised with Maarten de Rijke)	Olivier Sprangers (co-supervised with Maarten de Rijke)	Mariya Hendriksen (co-supervised with Maarten de Rijke)
Sami Jullien (co-supervised with Maarten de Rijke)	Arezoo Sarvi (co-supervised with Maarten de Rijke)	Sergey Redyuk, TU Berlin (co-supervised with Volker Markl)

Associated Researchers

Stefan Grafberger, TU Munich Master Student

Dr. Ji Zhang, Huawei Postdoc

• I am collaborating with Prof. Julia Stoyanovich from New York University on research with regard to the impact of data preprocessing on the fairness of machine-assisted decision making.

• I am conducting research on data validation and data cleaning for machine learning with Prof. Felix Biessmann from Beuth University, Berlin.
  
  

• I am an associated researcher with BIFOLD, the Berlin Institute for the Foundations of Learning and Data.
  
  

Before joining University of Amsterdam, I have been a Faculty Fellow at the Center for Data Science at New York University, and a Senior Applied Scientist at Amazon Core AI in Berlin, where I worked on data management-related issues of machine learning applications, such as demand forecasting, metadata and provenance tracking of machine learning pipelines and automating data quality verification.

I received my Ph.D. from TU Berlin in 2015, where I have been advised by Volker Markl, head of the database systems and information management group. My co-supervisors were Klaus-Robert Müller from the machine learning group at TU Berlin and Reza Zadeh from Stanford. During my studies, I have been interning with the SystemML group at IBM Research Almaden and the social recommendations team at Twitter in California.

I am engaged in open source as an elected member of the Apache Software Foundation, where I currently mentor the Apache TVM project on behalf of the Apache Incubator. In the past, I have been involved in the Apache Mahout, Apache Flink, Apache Giraph and Apache MXNet projects. I am currently actively contributing to deequ, a library for ‘unit-testing’ large datasets with Apache Spark and recoreco, a fast item-to-item recommender written in Rust.

I am the founder and chair of the workshop series on Data Management for End-To-End Machine Learning (DEEM) at ACM SIGMOD, which started in 2017.

I regularly review submissions to top tier data management conferences. I have been on the program committee at SIGMOD 2017, 2019-2021, VLDB 2021, ICDE 2018-2020, EDBT 2017 & 2021, CIKM’20, the workshop on Exploiting Artificial Intelligence Techniques for Data Management at SIGMOD 2019, the Large-Scale Recommender Systems workshop at the ACM RecSys 2013-2015, the workshop on Applied AI for Database Systems and Applications at VLDB’20, and Provenance Week’20. Additionally, I have reviewed submissions to journals for IEEE TKDE, ACM TIST, IEEE TPDS, IEEE TNNLS, VLDB Journal, the journal track of ECML/PKDD and the open source track of JMLR. I have also been a reviewer for the Amazon Research Awards.

I’m reachable via email at s.schelter[at]uva.nl. I’m also very actively using twitter as @sscdotopen. Most of the research code that I write is available under an open source license in my github account. Last but not least, I also have a profile in google scholar.