Question: Are Zhang Yang and Joshua L. Pomer of the same nationality?

Context paragraphs:
Zhang Yang (director): Zhang Yang (; born 1967) is a Chinese film director, screenwriter, and occasional actor.  He is the son of Zhang Huaxun, who is also a Chinese film director.

Driverless (film): Driverless is a 2010 Chinese romance film directed by Zhang Yang and starring Liu Ye, Ruby Lin, Gao Yuanyuan, Li Xiaoran, Chen Jianbin and Wang Luodan.  Director Zhang Yang says that this movie is an updated version of his 1997 film "Spicy Love Soup", and it presents love stories set in our current "material era."

Spicy Love Soup: Spicy Love Soup () is a 1997 Chinese film directed by Zhang Yang and written by Zhang, Liu Fendou, Cai Shangjun, and Diao Yi'nan based on a story by Zhang and Peter Loehr.  "Spicy Love Soup" was produced by Loehr's Imar Film Company, Xi'an Film Studio, and Taiwanese financing.

Sui Gu: Sui Gu (died 200), courtesy name Baitu (白兔), was a vassal serving under the warlord Zhang Yang in the late Eastern Han Dynasty.  When Zhang Yang was killed by Yang Chou out of fear for him joining Lü Bu, Sui avenged his lord by killing Yang Chou.  Afterwards, Sui Gu went on to serve under Yuan Shao.  However, Sui Gu was attacked and killed by Cao Cao's forces during the Battle of Guandu.

Zhang Yang (warlord): Zhang Yang (died 198), courtesy name Zhishu, was an official and minor warlord who lived in the late Eastern Han dynasty.  Originally from Yunzhong Commandery (雲中郡; northern Shanxi) in the north, he eventually became the "de facto" ruler of Henei Commandery (河內郡; southern Shanxi).  Although threatened by powerful warlords such as Cao Cao and Yuan Shao, Zhang Yang still provided refuge for Emperor Xian of Han numerous times, eventually attaining the rank of Grand Marshal (大司馬).

Cai Shangjun: Cai Shangjun () is a Chinese film director and screenwriter.  Cai graduated from the Central Academy of Drama in 1992.  Since then, his major work has been that of a professional screenwriter.  Cai was part of the team, along with Zhang Yang, Diao Yi'nan, and Liu Fendou, that co-wrote the screenplays for two of Zhang's films: "Spicy Love Soup" (1997) and "Shower" (1999).  Cai also cowrote a script for Zhang's "Sunflower" (2005).

Yang Chou: Yang Chou (died 198) was a military general serving under the warlord Zhang Yang during the late Han Dynasty period of China.  When Zhang Yang came to ask for the assistance of Lü Bu, Yang killed him out of fear, and joined Cao Cao.  Yang attempted to present the severed head of his lord to Cao Cao, but was slain by Sui Gu.

Spring Subway: Spring Subway () is a 2002 Chinese romance film directed by Zhang Yibai and starring Xu Jinglei and Geng Le.  Sixth Generation director Zhang Yang also plays a role.  The film represents a relatively new genre in China, the artistic "commercial film" with its international urban sensibilities designed to appeal to young middle-class Chinese.  "Spring Subway" is a stylistic film that plays with chronological conventions and flashbacks, and with characters that often break the fourth wall to directly address the audience.

Joshua L. Pomer: Joshua Pomer (born April 8, 1980) is an American film director, screenwriter, film producer and executive producer.

Shower (film): Shower () is a 1999 Chinese comedy-drama film directed by Zhang Yang and starring Zhu Xu, Pu Cunxin and Jiang Wu.  It premiered at the Toronto International Film Festival on 14 September 1999 and won the FIPRESCI Prize.  Though only the second directorial work by Zhang and the third production of Imar Film, "Shower" was selected for numerous film festivals, including San Sebastian Film Festival, Sundance Film Festival, and Seattle International Film Festival, where it received many awards.

Supporting paragraphs: Zhang Yang (director) Joshua L. Pomer
Answer: no