Sebastian Raschka is an independent LLM research engineer and the author of Build a Large Language Model (From Scratch) and Build a Reasoning Model (From Scratch). He writes Ahead of AI and develops practical explanations and implementations of language-model architectures, training, inference, and evaluation. He previously worked at Lightning AI and taught statistics and machine learning at the University of Wisconsin–Madison.
Sebastian Raschka is an independent LLM research engineer and the author of Build a Large Language Model (From Scratch) and Build a Reasoning Model (From Scratch). He writes Ahead of AI and develops practical explanations and implementations of language-model architectures, training, inference, and evaluation. He previously worked at Lightning AI and taught statistics and machine learning at the University of Wisconsin–Madison.
Career
Staff Research Engineer at Lightning until 2025Worked on AI engineering, research, and educational material at Lightning AI. Joined the company in 2022 and described leaving approximately three years later; earlier work included AI education.
Assistant Professor of Statistics at University of Wisconsin-Madison from 2018 to 2023Taught statistics, machine learning, and deep learning and researched deep neural networks.