
der Experte
expert
A person who has extensive knowledge and great skill in a specialized field; a specialist.
Für die Reparatur der alten Uhr müssen wir einen Experten finden.
We need to find an expert to repair the old clock.
expert
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expert
A person who has extensive knowledge and great skill in a specialized field; a specialist.
Für die Reparatur der alten Uhr müssen wir einen Experten finden.
We need to find an expert to repair the old clock.
'Der Experte' (the expert) belongs to the n-declension. This means it takes the ending '-n' in all cases except the nominative singular. This is a common source of mistakes.
Wir haben den Experten nach seiner Meinung gefragt.
We asked the expert for his opinion.
To name an expert's field, you usually use the preposition 'für' with the accusative or the phrase 'auf dem Gebiet' with the dative.
Sie ist eine anerkannte Expertin für mittelalterliche Geschichte.
She is a recognized expert in medieval history.
The word 'Experte' (expert) is international and belongs to a word family with terms like 'die Expertise' (expertise/specialist knowledge) or the adjective 'expert' (expert), which is rarely used, however.
Für diese Aufgabe benötigen wir jemanden mit technischer Expertise.
For this task, we need someone with technical expertise.
master / champion
Meister and Experte both refer to a person with a high level of competence. Meister emphasizes that someone is exceptionally good at performing an activity. Experte, by contrast, emphasizes extensive specialized knowledge in a particular field, even if that knowledge is not visible in practical skill.

Jonas kennt die Ursachen schwieriger Uhrfehler genau und ist ein Experte seines Fachs.
Jonas knows the causes of difficult watch problems exactly and is an expert in his field.
Jonas repariert selbst schwierige Uhren perfekt und ist ein Meister seines Fachs.
Jonas repairs even difficult watches perfectly and is a master of his trade.