Who was the engineer in charge of making the Willis Tower?
Fazlur Khan
Robert Mailloux
Santiago Calatrava
Robert Mailloux
Santiago Calatrava
Robert Maillart
Robert Mailloux
Santiago Calatrava
Daniel Libeskind
Robert Maillart
Maurice Koechlin
Maurice Koubek
Robert Mailloux
Santiago Calatrava
Fazlur Rahman Khan
Daniel Libeskind
Robert Maillart
I.M. Pei
Maurice Koechlin
Maurice Koubek
Robert Mailloux
Santiago Calatrava
Daniel Libeskind
Robert Maillart
Mies van der Rohe
Maurice Koechlin
Maurice Koubek
Harry Weese
I.M. Pei
Robert Mailloux
Santiago Calatrava
Ove Arup
Robert Maillart
Leo A. Perez
Daniel Libeskind
Severino Montano
Robert Moses
Maurice Koechlin
Maurice Koubek
Harry Weese
Robert Mailloux
Maurice Koenig
Santiago Calatrava
Mies van der Rohe
Leo A. Daly
I.M. Pei
Ove Arup
I.M. Pei,
Robert Maillart
Robert Moses
Leo A. Perez
Leo Hindery
Robert Venturi
Daniel Libeskind
Severino Montano
Maurice Koechlin
Maurice Koubek
Leo A. Percy
Harry Weese
Robert Mailloux
Maurice Koenig
Santiago Calatrava
Ove Arup
John Portman
Robert Moses
Fazlur Khan
Robert Maillart
Leo A. Daly
I.M. Pei
Gustav Lindenthal
Mies Van der Rohe
Robert Venturi
I.M. Pei,
Gustave Eiffel
Jacques Herzog
Leo Hindery
Santiago Calatrava.
Maurice Koechlin
Maurice Koubek
Daniel Libeskind
Robert Mailloux
Maurice Koenig
Santiago Calatrava
Mies van der Rohe
Robert Moses
Leo A. Perez
Leo A. Percy
John Portman
Ove Arup
John A. Singstad
Leo A. Perkins
Fazlur Rahman
Robert Maillart
David Childs
Robert Venturi
Harry Weese
Jacques Herzog
Leo Hindery
John A. Dietrich
Leo A. Daly
I.M. Pei
Santiago Calatrava.
Maurice Koechlin
Maurice Koubek
Robert Moses
Fazlur Khan
Maurice Koechlin,
Robert Mailloux
Ove Arup and Partners
Maurice Koenig
Santiago Calatrava
Mies Van der Rohe
Ove Arup
Severino Montuori
Daniel Libeskind
Shreyan Bhargava
Robert Maillart
Leo A. Perez
John Portman
David Childs
I.M. Pei,
I.M. Pei.
Leo A. Perkins
Leo A. Percy
Robert Venturi
Maurice Kogan
Martin Shkreli
Robert Moses
Leo Hindery
Harry Weese
Fazlur Rahman
Santiago Calatrava.
Maurice Koechlin
Maurice Koubek
Le Corbusier
Donald Trump
Leo A. Daly
Robert Mailloux
Maurice Koenig
Santiago Calatrava
Ove Arup and Partners
Ove Arup
Maurice Koechlin,
I.M. Pei
John Portman
Robert Maillart
John A. Dietrich
Fazlur Khan
Severino Montuori
Robert Venturi
Daniel Libeskind
Harry Weese Jr.
Robert Moses
Leo A. Perez
Shreveport, Illinois
I.M. Pei.
Martin Shkreli
I.M. Pei,
Donald Trump
Leo Hindery
Leo A. Perkins
Santiago Calatrava.
Maurice Koechlin
John A. Dietz
Mies Van der Rohe
Maurice Koubek
John A. Scanlan
Harry Weese
Maurice Koenig
Santiago Calatrava
Ove Arup and Partners
Fazlur Rahman
Leo A. Daly
Robert Maillart
Robert Mailloux
Robert Venturi
Robert Moses
Shreeram Bhatkar
John Portman
Ove Arup and Associates
Ove Arup and Sons
Maurice Koechlin,
Leo A. Perez
Donald Trump
Martin Shkreli
Leo A. Percy
Harry Weese Jr.
Shreveport, Illinois
I.M. Pei
Leo Hindery
Maurice Kogan
Santiago Calatrava.
Maurice Koechlin
I.M. Pei.
Maurice Koubek
Shreveport, Texas
Maurice Koenig
Santiago Calatrava
Leo A. Perkins
William Pereira
John A. Meissner