[7] He began playing tennis at 16-years-old before he studied medicine for four years at the University of Vienna.

In 1987 Skoff asked Bresnik to join him as coach during a five-week South American trip.

He coached Skoff for three years full-time, and, with encouragement from his father, never returned to medical school.

On 21 October 2016, Bresnik's first book, titled The Dominic Thiem Method, was published.

He has been criticized for having long-term protege Thiem ("his creature") play in too many tournaments and ending his seasons "on his kneecaps.

[24] Some of Bresnik's training techniques are unusual for tennis, such as putting weights around Thiem's waist, taking him into the woods and having him run back home; "I prefer to train outdoors...In Austria, to climb up the mountains, to go hiking, gives a mental boost to a player to get to the top.

"[25][26] Bresnik defended Thiem's heavy workload and vigorous fitness training, noting "you are not going to succeed in this sport if you are soft physically or mentally."

[32] In 2020-2021, Bresnik was working with Grand Slam semi-finalists Jerzy Janowicz and Ernests Gulbis.

He lives in Innermanzing, Lower Austria and runs a tennis academy in the Südstadt area.