Parse this person name:

Leszek Geisler (1916-1969, flourished 1944-1958)
user
first_name: Leszek
last_name: Geisler
middle_names: []
temporal:
- start: 1916
  end: 1969
  type: life_span
- start: 1944
  end: 1958
  type: flourished
titles: []
extra_info: []
assistant