Why did Thomas Geisbert like doing work with the hot viruses alone with his microscope?

Geisbert enjoyed isolation and the quiet it provided. Working alone gave hi a sense of peace.

"For Geisbert, identifying hot strains and classifying the tribes of viruses was like sorting butterflies or collecting flowers. He liked the loneliness of inner space, the sense of being forgotten by the world. He felt quiet and at peace with himself when he was padding around a hot zone carrying a rack of test tubes that held an unknown agent."