From the beginning of his medical career, he completed numerous assignments abroad, including in India, Bangladesh and the United States.

During his trip through India, Trabert became acquainted with the "outreach health care concept" Medical Streetwork, which primarily treated patients with leprosy.

Trabert was the first doctor in Germany to receive statutory health insurance approval for this form of mobile practice.

The organisation employs twenty doctors, nurses and social workers and provides uninsured patients including homeless people with free medical treatment.

[4] Before and during his studies, Gerhard Trabert was part of the German junior and student national athletics team.

His best time of 1:49.26 minutes for 800 meters, which Trabert set in 1981, is still included in the list of the "Eternal Top Ten" of the USC Mainz.

In the 2022 German presidential election on 13 February 2022, Die Linke nominated Trabert as its candidate against the incumbent Frank-Walter Steinmeier who was running for another term.

– Frank-Walter SteinmeierSteinmeier also suggested a meeting with Trabert in order to "bring more attention to this pressing issue together".

As part of his candidacy, Trabert pointed out the turning a blind eye to the conditions of refugees and poor people in Germany and drew a parallel to the turning a blind eye to the atrocities committed by the Nazis during the National Socialist era: "Just as many Germans knew back then what was happening to the Jews, today we know what is happening to refugees in the Mediterranean, in Libyan and Syrian camps.

[12][13][14][15] At the end of 2022, Trabert was one of the first signatories of a petition and campaign by DiEM25 to abandon the debt brake of the German balanced budget amendment.

[16] In February 2023, he was the first signatory of the "Manifesto for Peace" petition to Olaf Scholz, initiated by Sahra Wagenknecht and Alice Schwarzer, which called for diplomacy and negotiations and against further "escalating arms deliveries" to Ukraine in the wake of the Russian invasion.

[21] In 2019, Trabert was the first university of applied sciences teacher to receive the "University Teacher of the Year [de]" award, worth 10,000 euros; the ceremony was scheduled to take place on April 6, 2020, as part of the "Gala of German Science" in Berlin, but was cancelled due to the coronavirus.