der Mathematiker
mathematician
A person who works professionally or academically with mathematics.
Der Mathematiker entwickelte einen neuen Algorithmus zur Datenanalyse.
The mathematician developed a new algorithm for data analysis.

mathematician
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mathematician
A person who works professionally or academically with mathematics.
Der Mathematiker entwickelte einen neuen Algorithmus zur Datenanalyse.
The mathematician developed a new algorithm for data analysis.

The word is made up of the field 'die Mathematik' (mathematics) and the ending '-er'. The ending '-er' often refers to a male person who performs a certain activity or comes from a certain field.
Ein Informatiker beschäftigt sich mit Informatik, ein Mathematiker mit Mathematik.
A computer scientist works with computer science; a mathematician with mathematics.
'Der Mathematiker' (the mathematician) belongs to a word family. Related words are 'die Mathematik' (mathematics, the field) and 'mathematisch' (mathematical, the adjective).
Diese mathematische Aufgabe ist selbst für einen erfahrenen Mathematiker schwierig.
This mathematical problem is difficult even for an experienced mathematician.
Typical activities of a mathematician are often described with verbs such as 'eine Formel entwickeln' (to develop a formula), 'einen Beweis führen' (to provide a proof), or 'ein Problem lösen' (to solve a problem).
Die Mathematikerin versuchte, einen neuen Beweis für das Theorem zu finden.
The mathematician tried to find a new proof for the theorem.
statistician
'der Mathematiker' and 'der Statistiker' both refer to people who work professionally or academically with numbers, formulas, and calculations. The most important difference is the focus: a 'Mathematiker' works with mathematics in general, for example with structures, proofs, and models. A 'Statistiker' works especially with data: they collect, analyze, and interpret numbers from the real world. The words can be confused because statistics is a field that uses a lot of mathematics. When it is about pure theory or mathematical methods, 'Mathematiker' fits better. When it is about surveys, data, probabilities, or evaluations, 'Statistiker' is more precise.

Bei der Arbeit fragt das Team den Mathematiker, ob das neue Modell wirklich stimmt.
At work, the team asks the mathematician whether the new model is really correct.
Für die Studie wertet ein Statistiker die Daten von tausend Kunden aus.
For the study, a statistician analyzes the data from a thousand customers.