Tomislav Mohorić
Tomislav Mohorić (September 27, 1926 - January 28, 1990) was a Croatian swimmer and water polo player.
After ending his playing career he became a water polo and handball coach.
Marc Rosenberg (screenwriter)
Marc Rosenberg is an American screenwriter and producer, with professional roots in Australia.
Rosenberg currently splits his time between Los Angeles and Sydney, having taught screenwriting and film production in the U.S., India, Norway, China and Australia.
Rosenberg has contributed to" Film International Magazine" and written a screenwriting guide," The Screenplay Tree: Story Structure Made Easy."
Rosenberg is currently Director of Education at Sydney Film School.
Božo Grkinić
Božo Grkinić (November 17, 1913 – February 3, 1996) was Yugoslav water polo and basketball player and coach.
He was a member of the Yugoslavia national water polo team and Yugoslavia national basketball team.
Zlatko Šimenc
Zlatko Šimenc( born 29 November 1938) is a retired Croatian water polo player of Slovenian origin.
He was part of the Yugoslav teams that won a silver medal at the 1964 Olympics and placed fourth in 1960.
He won three more medals at the European championships in 1958 – 1966.
Šimenc's parents moved from Slovenia to Croatia before he was born.
They had three sons and one daughter, with Zlatko being the youngest child.
He took up swimming aged 11, and in his twenties changed to water polo and handball.
He trained as a water polo defender in the summer and as a handball striker in the winter, and won national titles in both sports with his club Mladost.
Between 1955 and 1975 he played 101 water polo and 24 handball matches for the national Yugoslav teams.
In 1958, Šimenc enrolled to study law, but next year changed to the newly established in Zagreb institute of physical education, and graduated in 1966.
He later earned a master's degree in social sciences and defended a PhD in kinesiology.
Since 1966 until retirement he worked at the Department of Team Sports of the University of Zagreb, and published ca. 60 scientific papers and books on handball and water polo.
In parallel he served as a sports official at the Yugoslav( 1980 – 82) and Croatian( 1992 – 96) water polo federations and was a member of the Croatian Olympic Committee( 1991 – 95).
His son Dubravko also became an Olympic medalist in water polo, while his daughter Iva is a coach and former competitor in synchronized swimming.
Peter Kemp (swimmer)
Peter Kemp( born 1878; date of death unknown) was a British competitive swimmer and water polo player of the late 19th and early 20th centuries.
He participated in water polo and swimming at the 1900 Summer Olympics in Paris, and won a bronze medal in the 200- metre obstacle event, and a gold medal in water polo as a member of the British team.
Yonca Şevval Erdem
Yonca Şevval Erdem( born) is a Turkish female water polo player, playing at the wing position.
She is part of the Turkey women's national water polo team.
She competed at the 2016 Women's European Water Polo Championship.
She is a member of 35 Water Polo and Swimming Club.
Victor Cadet
Victor Antoine Jules Cadet (17 June 1878 – 22 September 1911) was a French water polo player and swimmer.
He competed at the 1900 Summer Olympics in water polo and two swimming events and won a silver medal in the 200 m team swimming.
Thomas Hopkins (water polo)
Thomas Hopkins( born 13 April 1984) is an American water polo player.
He is 5'11 ” and 185 lbs.
He is a member of the United States men's national water polo team and competed at the 2007 FINA Men's Water Polo World League.
He studied at the Coronado High School.
He played college water polo at Stanford University.
He competed at the 2004 NCAA Men's Water Polo Championship and 2005 NCAA Men's Water Polo Championship.
René Tartara
René Pierre Charles Tartara( 14 November 1881 – 3 September 1922) was a French swimmer and water polo player.
He competed at the 1900 Summer Olympics in water polo and two swimming events, and won a bronze medal in the 200 m team swimming.
Brian Alexander (water polo)
Brian Alexander( born May 3, 1983) is a former American water polo player who was a member of the United States men's national water polo team.

Question: Do Brian Alexander (Water Polo) and Marc Rosenberg (Screenwriter) have the same nationality?
Answer: yes