Michael Rosenfeld was named president of National Geographic Television (NGT) in June 2006. He oversees all business and editorial activities for the company, which produces 120 hours of documentary television each year for the National Geographic Channel, PBS, and other broadcasters worldwide.

As president and in his previous role as executive vice president, programming and production, Rosenfeld has overseen a two-fold increase in production in just two years. To support this level of growth, Rosenfeld has extensively reorganized the company, creating five distinct production groups and opening production offices in New York and Los Angeles.

Prior to his promotion in March 2005 to executive vice president, Rosenfeld held the post of senior executive producer, responsible for Specials and event programming. In addition to the renowned National Geographic Specials on PBS, he oversaw some of National Geographic's most high-profile programs, including "Pearl Harbor: Legacy of Attack" for NBC, "Pyramids Live" for Fox, and "The Gospel of Judas" for National Geographic Channel.

Before taking over the National Geographic Specials in 1999, he was executive producer of National Geographic Explorer and was instrumental in shaping that series into a ratings and creative stronghold. Under his guidance, Explorer won 16 Emmy Awards and for three years in a row took the Cable Ace Award for best magazine series on cable television.

Rosenfeld began working on Explorer as a supervising writer, senior producer, and series producer, and became executive producer in 1993. While holding these positions he produced and wrote a wide variety of films, covering everything from volcanology to Indonesian death rites. His productions have won numerous awards, including an Emmy award for editing, a Chris Award, Best Video from the Banff Festival of Mountain Films, a Gold Award from the Houston International Film Festival, and a Special Jury Award from the San Francisco International Film Festival.

Before joining National Geographic, Rosenfeld worked as a field producer for WNET in New York and as a freelance writer, producer, and journalist.

He lives in Washington, D.C., with his wife and three children.

As senior vice president, editorial development, at National Geographic Television (NGT), Maryanne Culpepper oversees story development for all NGT programming.

Culpepper was appointed to her current position in 2003 and plays a key role in extending National Geographic's editorial assets to the broadcast format. To this end, Culpepper develops content and coordinates cross-divisional planning throughout National Geographic, utilizing Society-wide media, talent, and marketing. Working closely with NGT's editorial groups, Culpepper spearheads efforts toward long-range editorial planning and facilitating collaboration between various production units, while initiating a consolidated review process for external proposals submitted to both NGT and National Geographic Channel.

Culpepper, an Emmy award-winning writer/producer with 20 years experience in television production and broadcast management, joined National Geographic Television in 1996 as director, story development. In this position she analyzed and evaluated film/series proposals and oversaw various aspects of the production process, including field research, treatment writing, and rights negotiation. Other responsibilities included the development of editorial content and the commission of production assignments.

Prior to joining National Geographic, Culpepper was founder and president of Graffiti Works, a film and video production company based in Orlando, Florida, and Washington, D.C. Other previous positions include producer/director at Auburn Television, where she produced, directed, and wrote documentary and public affairs/informational programming for PBS' national and regional broadcast, and research director for WUFT-TV, Gainesville, Florida's public television station.

Culpepper won a regional Emmy award (Suncoast) for excellence in Children's and Family Programming for "Food TV," a comedy series on nutrition that aired on PBS. She has also won multiple CINE Golden Eagle awards, including one as writer of "At the Time of Diagnosis," a multipart series for Time-Life hosted by Dr. C. Everett Koop. "Lost in Time" was her first documentary production to air nationally on PBS in 1984.

Culpepper earned her Bachelor of Science in journalism and communications and a master's degree in communication from the University of Florida.

Kathy Davidov joined National Geographic Television as vice president, series, in January 2006. She is responsible for the Series Production Unit, the Science Unit, and Explorer (National Geographic's signature series). She reports to NGT President Michael Rosenfeld.

Prior to joining National Geographic, Davidov worked for Discovery Communications Inc. for nine years. As executive producer, she managed more than 500 hours of original programming for shows including "Trading Spaces," "Junkyard Wars," "Medical Detectives, "Maternity Ward," "Tuckerville," "Faking It" and "Ballroom Bootcamp." Earlier at Discovery, she was senior producer for the special programming unit and oversaw production and development for the Great Books and Understanding series, as well as numerous hard-hitting, critically acclaimed specials.

Davidov started her television career as a producer for NBC News based in London and went on to work as a freelance producer, producing several U.S. and Canadian news programs for a wide range of broadcasters including Fashion Television, Channel One, "America's Most Wanted," The Discovery Channel and National Geographic.

Davidov has a B.A. in drama from George Washington University.

Stephen Reverand joined National Geographic Television as a senior vice president in March 2006. Reporting directly to NGT President Michael Rosenfeld, Reverand is responsible for overseeing NGT's Specials Unit as well as its world-renowned National History Unit.

Prior to joining NGT, Reverand oversaw the production of series, specials, and documentaries for Discovery Channel as vice president of production. There, he played key roles in the development and production of "The Flight That Fought Back," which documented the heroism of the passengers on United Flight 93 and attracted the third-largest viewing audience in Discovery Channel's 20-year history.

In April 2005, Reverand was awarded a George Foster Peabody Award for his editorial oversight of "Black Sky: The Race for Space," which chronicled aerospace pioneer Burt Rutan's three-year pursuit of private space travel.

Reverand joined Discovery Channel in 2000 as an executive producer and was later named managing editor, contextual documentaries. In his five years with the network, he played pivotal roles in producing several of Discovery Channel's most highly rated projects, including "Supervolcano" and "Behind the Terror: Understanding the Enemy."

Prior to joining Discovery, Reverand was president of Rising Tide Media, whose productions included the 13-episode PBS series "Boatworks" and live specials around the globe for "Wall $treet Week."

Reverand's television career began at NBC News. He was NBC's bureau chief in Tokyo, Japan, and in Seoul, South Korea, for the 1988 Olympics; a radio correspondent; contributing correspondent to NBC Nightly News and the BBC's World Service; Northeast bureau writer/producer; and director of news editing. He holds a Master of Science degree from the Columbia University Graduate School of Journalism.

Michael Castro joined National Geographic Television as vice president of operations in July 2006. He has an extensive background in broadcast and cable production and has helped launch new networks and programs throughout his career.

From 2004 through mid-2006, Castro ran has own consulting business. Projects included producing the high-definition news pool coverage of the Democratic and Republican national conventions in 2004, relaunching the syndicated tabloid program "A Current Affair" for 20th Century Fox in 2005, and working with the Fox News Channel on their disaster-recovery planning.

From 1999 to 2004, he was vice president of production for all A&E Television Networks, including production oversight of the A&E Network, The History Channel, The Biography Channel, History International and AETN Home Video. With more than 50 staff and 100 freelance personnel, Castro directed all phases of production, from live, studio, location, and post-production to contract negotiations, department policy, operational procedures, and program delivery. He was responsible for more than $30 million in operating and administrative budgets.

Prior to joining A&E, he was director of post-production for the USA Networks, including the Sci-Fi Channel from 1995 to 1999. He was in charge of all editing, graphics, audio, scheduling, and personnel for the USA in-house production facility.

Castro started his career at NBC, where he worked on a variety of programs including "The Today Show," "Dateline NBC," "Real Life with Jane Pauley," "Sunday Today," and "NBC News Specials." During his years at NBC, he traveled extensively in the United States, South America, Western Europe, Middle East and Asia, coordinating production on major news stories and political events.

Scott Wyerman joined National Geographic Television as a researcher in 1987 when his main focus was the accuracy of the weekly Explorer series, which then aired on Turner Broadcasting. Today he runs a department unique in the world of television, film, and digital media. It is ultimately his responsibility to be the voice of National Geographic Ventures on issues of fact and also to weigh in on areas such as style, tone, and journalistic balance and fairness.

As senior vice president of standards and practices, NGV, Wyerman is responsible for not only accuracy but for the editorial integrity of all NGT products and their related materials, including National Geographic Specials, the weekly Explorer series, various other series and specials, television dramas and theatrical features, kids entertainment, TV-related online features, giant-screen film productions, and merchandise.

His department also provides standards-and-practices services for all programming aired on the National Geographic Channels, both domestically and in 163 countries worldwide, ensuring that all productions meet brand standards for accuracy and integrity. His group also supervises a translations department.

Wyerman lives in Falls Church, Virginia, with his wife and three children.