Zwack was born into a noble family, which facilitated his early education and career pursuits. Little is known about his early life and education, but it is evident that his upbringing prepared him for a career in diplomacy and statecraft. His family's connections and his own intellectual capabilities likely paved the way for his entry into the diplomatic corps.

Zwack's career in diplomacy began in the service of the Holy Roman Empire. He quickly distinguished himself with his skills in negotiation and his deep understanding of European politics. His expertise and linguistic abilities (he was known to speak multiple languages) made him an invaluable asset to his employers.

Some of his notable achievements include:

Xavier von Zwack's career spans multiple disciplines, making him a true Renaissance man. While specific details about his work are not readily available, his contributions to various fields have been acknowledged and appreciated.