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
'der Meister' and 'der Experte' can both mean a person who is very good in a particular field. 'Experte' mainly emphasizes specialist knowledge and experience in a specific subject. You ask an expert when you need precise information or a solution. 'Meister' can be an official title in the skilled trades, but it can also mean a person with exceptional ability. The words can be confused because both express competence. When it is about knowledge and advice, 'Experte' usually sounds more natural. When it is about craft training, special skill, or perfection, 'Meister' fits better.

Für das Bauprojekt holen wir einen Experten für alte Häuser dazu.
For the construction project, we are bringing in an expert on old houses.
In der Werkstatt prüft der Meister die Arbeit der Auszubildenden.
In the workshop, the master craftsman checks the apprentices' work.