Willem Buys was acting Grand Pensionary

Grand Pensionary

The Grand Pensionary was the most important Dutch official during the time of the United Provinces. In theory he was only a civil servant of the Estates of the dominant province among the Seven United Provinces: the county of Holland...

 of Holland in 1745 and 1746. He was pensionary of Amsterdam

Amsterdam

Amsterdam is the largest city and the capital of the Netherlands. The current position of Amsterdam as capital city of the Kingdom of the Netherlands is governed by the constitution of August 24, 1815 and its successors. Amsterdam has a population of 783,364 within city limits, an urban population...

 (1693–1725) and first secretary of the estates of Holland (1726–1749).

He had successes as negotiator of the United Provinces

Dutch Republic

The Dutch Republic — officially known as the Republic of the Seven United Netherlands , the Republic of the United Netherlands, or the Republic of the Seven United Provinces — was a republic in Europe existing from 1581 to 1795, preceding the Batavian Republic and ultimately...

. He improved the diplomatic relationship with England in 1705 and 1706 and he was one of the Dutch negotiators during the peace negotiations in 1710 in Geertruidenberg

Geertruidenberg

Geertruidenberg is a city and municipality in the province North Brabant in the south of the Netherlands. The city, named after Saint Gertrude of Nivelles, received city rights in 1213 from the count of Holland. The fortified city prospered until the 15th century.Today, the municipality of...

 and 1713 in Utrecht

Utrecht (city)

Utrecht city and municipality is the capital and most populous city of the Dutch province of Utrecht. It is located in the eastern corner of the Randstad conurbation, and is the fourth largest city of the Netherlands with a population of 312,634 on 1 Jan 2011.Utrecht's ancient city centre features...

.