 He later characterized Stanislaw Ulam was the "father" of the hydrogen bomb, and Edward Teller as its "mother," and himself as its "midwife."
<clarity>  He later characterized Stanislaw Ulam was the "father" of the hydrogen bomb, and Edward Teller as its "mother," and himself as its "midwife."
 He later characterized Stanislaw Ulam was the "father" of the hydrogen bomb, and as its "mother," and himself as its "midwife."