Probability Theory and Statistics, for your university course or for self study. I speak english and live in Berlin.

I worked with Andrei while preparing for a tough postgraduate Algorithmics exam, and I couldn’t recommend him more highly. He’s extremely knowledgeable, comfortable with everything from algorithm analysis and proofs to complexity theory — but what really sets him apart is how he teaches: clear, patient, and always starting from concrete examples before the formal stuff, which made even the hardest topics click. He was also incredibly flexible with scheduling and adapted every session to exactly what I needed, whether that was drilling exam questions, marking my answers strictly, or re-explaining something until it genuinely stuck. On top of all that, he’s just a really nice, encouraging person to learn from. If you want a tutor who is smart, kind, and actually gets results, book him.

Andrei’s dedication to his students is second to none. I have yet to meet a tutor as committed to his students as he is—patient, insightful, and, most importantly, genuinely kind.

I reached out to Andrei at the beginning of my dissertation, when I had a general idea of my topic and structure but was determined to achieve nothing less than a distinction. From the outset, Andrei challenged my thinking and methods in a constructive and rigorous manner.

What I valued most was that he never simply gave me the answers. Instead, he carefully scrutinised my approach, challenged my assumptions, and guided me towards finding better solutions myself. His feedback was thoughtful, precise, and consistently pushed me to produce work of a higher standard.

I am delighted to say that I will be graduating with a distinction. I have no doubt that Andrei’s guidance, encouragement, and unwavering dedication played a significant role in helping me achieve it. I am deeply grateful for his support and would wholeheartedly recommend him to anyone looking for an exceptional tutor.

Andrei helped me prepare for a mathematical methods module at university. He was always engaged, and prepared additional notes and exercises. Also always found a convenient time to meet given the upcoming exam date. Great guy passionate about mathematics. Would recommend!

Very good at explaining things from first principles. Very polite, too. Many maths tutors can make the student feel stupid for not knowing something, but Andrei is certainly not that. Highly recommended.

Super Kommunikation und Absprache.
Der Verlauf und die Erklärung des Inhalts waren sehr informationsreich. Andrei kann ich definitiv weiterempfehlen!

Andrei is a very good tutor and helped me get through my exams with great teaching and understanding of my course, would highly recommend him as he helped me a lot!

He is an exceptional, patient, and highly knowledgeable tutor. I have worked with him for several sessions, and I am always impressed by his ability to explain even the most complex topics in a clear, structured, and understandable way. He always takes the time to answer questions thoroughly and adapts each lesson to the student’s level and needs. His positive attitude, motivation, and genuine interest in helping his students succeed make every session both productive and enjoyable.

An amazing few weeks filled with extremely useful tips and tricks, as well as clear, logical explanations. A genuinely kind and supportive person who helped me achieve a top score

Andrei is an excellent tutor. He explains concepts clearly and makes it easy to ask questions. I really appreciate how he adapts his teaching style to my needs and pace. I always feel supported and encouraged during our lessons. Highly recommend!

I highly recommend Andrei’s tutoring! His lessons are clear, well-structured, and adapted to each student’s individual needs. He takes the time to explain difficult concepts in an easy-to-understand way and always makes sure you truly grasp the material. Thanks to his patient and motivating teaching style, learning with him is both effective and enjoyable. Personally, I can only recommend taking lessons with Andrei you won’t regret it!

Andrei is an amazing tutor! He has helped me with the coding side of my statistics masters course. His lessons are very thorough and he prepares for every lesson. He explains clearly not only the coding side but the biological side as well. If you are looking for a tutor you have found the best one!

I am a university student in the UK, studying machine learning as part of my degree. Andrei provided me with an excellent learning experience, guiding me through numerous machine learning concepts. He covered everything from theoretical foundations, including mathematical derivations, to practical applications in Python. His lessons were incredibly helpful and aligned perfectly with the structure of my machine learning curriculum. I highly recommend Andrei as a tutor!

I am delighted to write a recommendation for Andrei. Andrei has supported me for my math based and coding related subjects. Learning with Andrei has given me an opportunity to expand my creativity with my subjects. He has guided me through solving problems that would have evaded me otherwise.

Andrei has engaged with me in exceedingly helpful ways, and am sure does so with other people.

Andrei was a great tutor and helped me understand R studio very well in a couple weeks when i had no prior experience - very nice and answers all questions super clearly!

His attention to detail, passion for what he does and vast array of knowledge all contribute to why I would highly recommend Andrei as a tutor. He is quick to make you feel at ease and communicates effectively so you can grasp a deep understanding of what you are striving to achieve.

Super nice! Definitely recommended! Andrei is a very nice and patient tutor!

Andrei is a highly trustworthy teacher for several reasons. For the past 6-7 months, he has consistently provided me with ample study material for the SAT exam. Andrei's guidance throughout my SAT preparation journey highlights his dedication to helping me achieve a good score. His patience in addressing my questions and concerns shows that he genuinely cares about your progress and academic wellbeing.
So, to whom it may concern, I wholeheartedly recommend Andrei's tutoring services in the realm of SAT prep. .
Cheers to you, Andrei!

Andrei Ciupan is an excellent teacher, possessing a remarkable amount of patience and a talent for inspiring and motivating students.

Thanks to Andrei's help, I achieved the highest possible score on the SAT math section.

Andreea

Ich würde Andrei als Nachhilfelehrer sehr empfehlen. Sein Unterricht ist sehr informativ und er kommuniziert klar. Er hat mir geholfen, meinen Lehrplan zu verstehen und meine Prüfungsfähigkeiten zu verbessern.

I've known Andrei for many years, since he was a student at Harvard. I highly recommend him as a teacher – Andrei has always been amazing at explaining concepts, from the simplest to the most complicated. Furthermore, I was impressed at his understanding and deep passion for statistics and for research topics that relate to stats. Whenever I had a question about such topics, Andrei was very patient in explaining it, and really helped me get the intuition behind difficult concepts through examples and visualizations. He has a great way of weaving math and its applications to different domains, such as economics, computer science, and statistics, and is very rigorous in his understanding of the fundamental math concepts behind different theories.

Because my background is more in literature and cultural studies, I was initially overwhelmed by the statistics problems I encountered in statistics in my cognitive sciences major.
I learned with Andrei to take even the most complex statistics problems step by step. In a methodical and accessible approach, we deconstructed each task together, saw what the logical steps were, and in turn established the operations needed to get to the essence of each situation. In this way, I started to solve each new statistics problem more autonomously and faster.
Through this practical method, I also managed to learn the theoretical concepts better and anchor them in my long-term memory.

Andrei is a very good mentor, capable and very kind to his students. In addition to this, he is very involved in preparing students for the SAT. Throughout the sessions, he helped me solve difficult problems, giving me confidence in my potential. Anyone who will have Andrei as a mentor will realize his qualities right from the start and will fully succeed. Andrei is an unique mentor and teacher, who will always be there for you when you need him.

I think any student would enjoy working with Andrei because he is very patient, knowledgeable and enjoys teaching. He is definitely a superprof!

I think any student would love to work with Andrei because he is very patient, knowledgeable and loves teaching. Definitely recommend him, he is a superprof!

We established a really good work rhythm, and our meetings were efficient, since Andrei always focused on approaching the problems that posed the greatest difficulty first. I really enjoyed our lessons, which I believe is mostly because I felt relaxed, yet also serious and encouraged to work. The purpose of our meetings was preparation for the SAT exam, and my test score improved significantly after those.

Andrei was one of the best teaching assistants that I had in college. Andrei provides clear explanations for mathematical concepts, and does a great job helping students to internalize new ideas. Andrei was particularly helpful in office hours, as he combines mathematical knowledge and an empathetic attitude in showing students how to apply and extend their knowledge of the course material. Talking to Andrei about math really helped to improve my proof-writing ability and prepared me for further undergraduate and graduate study in mathematics. Dan, Harvard University