, the tepper foundation, peter and mary kalikow, the asness family foundation, the beth and ravenel curryndation, the mckenna family foundation, charles r. schwab, and by the pritzker military foundation on behalf of the pritzker military museum and library, the rosalind p. walter foundation, damon button, craig newmark philanthropies, roger and susan hertog, cheryl cohen effron and blair effron, al and kathy hubbard. corporate funding is ovided by stephens, inc. and by pfizer inc. [bright music] - sheila johnson, welcome to "firi line." - thank you so much. this is an honor. - you recently published your memoir. - yes. - "walk through fire: a memoir of love, loss, and triumph." the book starts with you as a 16-year-old girl coming home to the harsh reality that your father, who is a neurosurgeon, your mother, who is an accountant, decided to split up. it was your father's decision. and this, as you write, is a pivotal early moment in your life that shapes you. - absolutely. - [margaret] how? - i had to grow up real fast. i had to take charge of the family. my mother, she just had a compl