What is michael a. peterson?

Unfortunately, as an AI language model, I do not have access to all the information on individuals. However, Michael A. Peterson is an American author known for his true crime book "The Staircase", which tells the story of his own trial for the murder of his wife Kathleen Peterson. Michael Peterson was convicted of murdering his wife in 2001 and was sentenced to life in prison without parole. However, in 2017, after new evidence emerged, he was granted a new trial and pleaded guilty to manslaughter for which he was sentenced to time already served and released from prison.