Doctor Berel was a male Malcorian physician in the 24th century. By 2367, he became director of the Sikla Medical Facility on Malcor III. Berel was a very dedicated physician who took his oath seriously.
He was brought in to treat a Malcorian named Rivas Jakara, when genetic irregularities were found with him. In reality, it was Commander William T. Riker disguised as a Malcorian, during a surveillance mission to see if first contact should be made with the planet. Despite his apparently being an alien, Berel treated him like any other patient and ensured he was taken care of. He delayed contacting Central Security about his existence so that they could check out his story. He even had to calm his doctors and nurses when they became aware of the irregularities.
When Minister of Internal Security, Krola, was contacted about Riker, Krola put guards on him to keep him contained. He later ordered Berel to wake Riker so he could be interrogated. Berel refused, on the grounds that doing so would violate medical ethics, since he was still in critical condition. He was relieved of his duties. (TNG: "First Contact")