Parse this person name:

Jonas Geertsen, 1816-1859, flourished 1832-1849
user
first_name: Jonas
last_name: Geertsen
middle_names: []
temporal:
- start: 1816
  end: 1859
  type: life_span
- start: 1832
  end: 1849
  type: flourished
titles: []
extra_info: []
assistant