Parse this person name:

Ansgar Geisel, 1819-1882, flourished 1848-1870
user
first_name: Ansgar
last_name: Geisel
middle_names: []
temporal:
- start: 1819
  end: 1882
  type: life_span
- start: 1848
  end: 1870
  type: flourished
titles: []
extra_info: []
assistant