who is the greatest architect in the world as at today.?

Answer 1

There are so many to choose from it just depends on what type of work fascinates you the most but here are some of the most well known.

Frank Owen Gehry
Frank Lloyd Wright
Cesar Pelli

You can even go back to say that the Egyptians, with the tools they had, were some of the best architects the world has even seen. If they were able to create structures like they did with the knowledge they had imagine what they could do today. Then look at what the Romans built.

Answer 2

Good question and a matter of opinion. But the greatest living architect? Probably I.M. Pei or if not then Gehry.
To give you a sense of why Pei, here is a list of his buildings:
1954–1959 — Mile High Center, in Denver, Colorado, USA
1961–1967 — National Center for Atmospheric Research, in Boulder, Colorado, USA
1961 — Kips Bay Plaza, in New York, New York, USA
1961 — Government Center Master Plan, Boston, Massachusetts, USA
1962 — Place Ville-Marie, in Montreal, Quebec, Canada
1962 — Kennedy Theatre, University of Hawaii, USA, Official web page
1962 — Hale Manoa Dormitory, East West Center, University of Hawaii, USA
1963 — Luce Memorial Chapel, Tunghai University, Taichung, Taiwan
1963 — Society Hill Towers – Philadelphia, PA, Unofficial website
1964 — Green Building, Massachusetts Institute of Technology
1964 — S.I. Newhouse School of Public Communications at Syracuse University — Syracuse, New York
1966–1968 — Sculpture Wing of the Des Moines Art Center in Des Moines, Iowa
Official page of Pei's Sculpture Wing
1966 — Silver Towers at New York University
1967 — Hoffman Hall at University of Southern California
1968–1972 — 50 FAA air traffic control towers, in various locations throughout the United States.
1968–1974 — Christian Science Center, in Boston, Massachusetts
1968 — Everson Museum of Art, in Syracuse, New York
1969 — Cleo Rogers Memorial Library, in Columbus, Indiana
1969 — Academic Center, State University of New York at Fredonia, Fredonia, New York
1970 — National Airlines terminal at JFK Airport in New York, New York
1971 — Harbor Towers, in Boston, Massachusetts
1972 — Governor's Residence Halls at SUNY Buffalo
1972 — Dallas, Texas City Hall
1972 — Paul Mellon Arts Center at Choate Rosemary Hall in Wallingford, Connecticut
1972 — Pei Residence Halls at New College of Florida, Sarasota, Florida
1973 — Commerce Court West in Toronto, Ontario
1973 — Spelman Halls at Princeton University
1973 — Herbert F. Johnson Museum of Art, Cornell University, in Ithaca, New York
1974–1978 — East Building, National Gallery of Art, in Washington, DC
Official East Building project webpage
1975 — OCBC Centre in Singapore.
1975 — The Lamar Building Penthouse in Augusta, Georgia
1976 — John Hancock Tower, in Boston, Massachusetts — Pei gives Henry Cobb the credit for this building
1976 — University of Rochester's Wilson Commons
1978–1982 — Indiana University Art Museum in Bloomington, Indiana
1979 — John F. Kennedy Library, in Boston, Massachusetts[5]
1979 — Baltimore World Trade Center, in Baltimore, Maryland
1979–1986 — Javits Convention Center in New York, New York
1980–1985 — Raffles City in Singapore.
1981 — the Texas Commerce Tower in Houston, Texas, currently the JPMorgan Chase Tower; (3D/International cooperated with Pei on the design of this building)
1982 — 16th Street Mall in Denver, Colorado.
1982–1990 — Bank of China Tower, in Hong Kong
Bank of China Tower project website
1982 — Apartment for Steve Jobs
1983 — Energy Plaza, Dallas, Texas
1985 — Wiesner building, MIT, Cambridge, Massachusetts
1986 — Fountain Place, Dallas, Texas
1987 — CenTrust Tower, Miami, Florida
1989 — Morton H. Meyerson Symphony Center in Dallas, Texas
1989 — Carl Icahn Center for Science at Choate Rosemary Hall in Wallingford, Connecticut
1989 — Headquarters for Creative Artists Agency, Los Angeles, California
1989 — Pyramids of the Louvre, in Paris, France
1991 — Miho Museum, Shiga, Japan
1992 — The Kirklin Clinic of the University of Alabama at Birmingham Health System, Birmingham, Alabama
1994 — Four Seasons Hotel New York, New York City, New York
1995 — Rock and Roll Hall of Fame, in Cleveland, Ohio
1997 — Miho Museum, near Kyoto, Japan.
1999–2006 — Musée d'Art Moderne Grand-Duc Jean, in Luxembourg City, Luxembourg
2001 — Friend Center for Engineering, at Princeton University.
2002 — Tour EDF, La Défense, France
2003 — extension building to the Deutsches Historisches Museum (German history museum), in Berlin, Germany.
2005 — Ferguson Center for the Performing Arts at Christopher Newport University in Newport News, Virginia.
2006 — Martha Stewart Center for Living at Mount Sinai Hospital in Manhattan (currently under construction).
2006 — Embassy of the People’s Republic of China, Washington D.C.(currently under construction).
2002–2006 — New wing of Suzhou Museum, in Suzhou, China
2002–2008 — Ronald Reagan UCLA Medical Center in Los Angeles, CA
2009 — NASCAR Hall of Fame, Charlotte, North Carolina.

Answer 3

I.M. Pei

Answer 4

why....me of course

Answer 5

god....