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Roger Garriga Calleja's work experience includes:

- Lead Research Data Scientist at Koa Health since July 2022. In this role, they lead a team of data scientists in building machine learning models based on electronic health data to improve clinical and operational processes. Roger also develops machine learning models based on active and passive data from mental health patients and coordinates with internal and external stakeholders.

- Senior Research Data Scientist at Koa Health from October 2020 to September 2022.

- Professor (MSc in Data Science) at Barcelona School of Economics since September 2021.

- Research Data Scientist at Alpha from October 2017 to October 2020. In this role, they conducted research in digital health and behavioral modeling. Roger successfully conducted a predictive analytic study with data from a mental health hospital and brought the research results into production for the hospital.

- Data Scientist Intern at Alpha from May 2017 to October 2017.

- Data Analyst at Expense Reduction Analysts from July 2014 to September 2016. Roger developed Visual Basic routines to automate analysis and used SQL queries to analyze and visualize telecommunication data, resulting in reduced client expenditure.

- Data Analysis Internship at Ipsom Efficiency from October 2013 to February 2014. Roger developed Visual Basic routines to automate analysis and clean data and designed a relational database for managing clients' information and monthly energy expenditure.

Roger Garriga Calleja has a diverse education history in the fields of artificial intelligence, machine learning, data science, statistics, mathematics, and physics. From 2019 to 2022, they pursued a Doctor of Philosophy (PhD) degree in Artificial Intelligence and Machine Learning at Universitat Pompeu Fabra, specializing in the field of health. Prior to this, from 2016 to 2017, they obtained a Master of Science (MS) degree in Data Science from Barcelona School of Economics, with a focus on data science and statistics. Earlier, from 2010 to 2016, Roger completed their undergraduate studies at Universitat Autònoma de Barcelona, earning degrees in both Mathematics and Physics.

In addition to their formal education, Roger holds several certifications to further enhance their knowledge and skills. Roger completed courses such as "Improving Deep Neural Networks: Hyperparameter tuning, Regularization and Optimization," "Neural Networks and Deep Learning," and "Structuring Machine Learning Projects" offered by deeplearning.ai on Coursera in September 2017. Roger also obtained the IELTS (International English Language Testing System) certification at a C1 level from the British Council in March 2016 and the Certificate Advanced in English (CAE) from Cambridge English Language Assessment in September 2012.

Furthermore, Roger has pursued additional learning opportunities through various programs and institutions. Roger completed the "Social-Behavioral and Educational Sciences Researchers Responsible Conduct of Research" and "Social/Behavioral Research Course" programs offered by the CITI Program in July 2022. Moreover, they have attended courses on "The Brain and Space" and "Visual Perception and the Brain" at Duke University, although the specific details regarding the dates and achievements of these programs are not provided.