Conversation so far:
Where was Mary Surratt buried?
Mary Surratt was buried in Mount Olivet Cemetery in Washington, D.C., on February 9, 1869.
What did Mary Surratt die of?
Mary Surratt was hanged.
Was Mary Surratt also sentenced to death?
Mary Surratt was sentenced to death.
What prison did Mary Surratt's hanging occur?
After her arrest, Mary Surratt was held at an annex to the Old Capitol Prison before being transferred to the Washington Arsenal on April 30.
Was John Wilkes Booth also hung at Old Capitol Prison?
John Wilkes Booth, fatally wounded in the neck, was dragged from the barn to the porch of Garrett's farmhouse, where he died three hours later, aged 26
Are there any other interesting aspects about Mary Surratt and her death and burial besides where she was buried, being sentenced to hang to death, and where John Wilkes Booth died?
Mary Surratt's daughter, Anna Surratt, unsuccessfully asked for her mother's body for four years.
Was there a controversy over transferring over Mary Surratt's body to her family?
In February 1869, President Andrew Johnson agreed give John Wilkes Booth's body to the Booth family, and on February 8 Mary Surratt's body was turned over to the Surratt family.

Question: who is johnson?
Self-contained rewrite: Who is Andrew Johnson?