This is the consultancy arm of the school, whose mission is to improve the health of people in the less-developed world, by helping to set up health programmes for overseas governments and other organisations. These can range from helping to improve the health of pregnant women in Africa to implementing TB control programmes in China.
Before coming to Liverpool a couple of years ago - "the Liverpool School has a very good reputation", she maintained - Marielle was working at camps in Africa where the refugee problem is particularly acute.
"In these camps, there are people coming in very exhausted from their home villages, suffering from different diseases and trauma. It's very difficult, though, because there are so many complex issues going on, especially when all these people come in at once. You have to try to find out who actually are the village leaders or the people in the community who will listen to you, and take appropriate action quickly because there are people dying every day."
Her stint in South Africa, however, was far from a matter of life and death, where her duties even extended to supervising the authenticity of the dress of the extras on set.
"You had to tell the ladies to take off their sunglasses or get them to wear the right kind of sneakers because refugees would not be able to get hold of many of these things."
Although viewers in this country have yet to see the new series, the first episodes have already been broadcast in the States where it was watched by an estimated 40m viewers.
Such colossal viewing figures were a major spur to Marielle.
"Because ER reaches such a huge number of people and countries, it made it a great motivation for me to be part of the series, in which it addresses issues in Africa, which might give a bit more understanding about them to members of the general public, and make them aware of the major problems, such as Aids, affecting many of the countries over there.
"The refugee situation is very serious over there and people are suffering on a massive scale, but there are things that can be done about it."
She added: "There is no need for such suffering, when the diseases are easily treatable if the right kind of drugs are made available."
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