Question:
Yen was born in Guangzhou, China. His mother, Bow-sim Mark, is a Fu Style Wudangquan (internal martial arts) and Tai Chi grandmaster, while his father, Klyster Yen (Zhen Yun Long ), is a newspaper editor. When he was two years old, his family moved to Hong Kong and then to Boston when he was 11. His younger sister, Chris Yen, is also a martial artist and actress, and appeared in the 2007 film Adventures of Johnny Tao: Rock Around the Dragon.
Yen describes himself as a mixed martial artist. He learned Tai Chi from a young age under his mother's tutelage. He then wanted to learn Taekwondo in his teenage years, earning a 6th Dan in the process. At the time, the Beijing Wushu Team had a scout in the United States and invited Yen over to Beijing, China, where he began training at the Beijing Sports Institute, the same facility where champion-turned-actor Jet Li trained; this is where the two of them crossed paths for the first time. Upon his return to the United States, Yen won gold medals in various wushu competitions. Yen later went on to discover and seek knowledge on other martial arts styles; he would later obtain black and purple belts from judo and Brazilian Jiu-Jitsu, respectively, and went on to study the art of Parkour, Wrestling, Muay Thai, Kickboxing and Boxing under various trainers. His exposure to mixed martial arts (MMA) was heightened when he went back to the United States from 2000 to 2003. While making his Hollywood debut, he also took time off to learn the various martial arts forms. Yen's progress was evident when he returned to Asia, where he implemented his newfound knowledge of MMA, showcased in films such as SPL: Sha Po Lang (2005), Flash Point (2007), and Special ID (2013). Near the end of 2007, Yen added a new martial arts system to his arsenal. He was offered the role of Wing Chun grandmaster and mentor of film star Bruce Lee, Ip Man, in a 2008 film named after the grandmaster. He worked hard and studied Wing Chun under Ip Man's eldest son, Ip Chun, for 9 months before tackling the role. Ip Chun has since praised Yen for his effort, his skills as a martial artist, and his ability to grasp the full concept of Wing Chun much faster than anyone else he has taught. Yen believes that combining many martial arts together will produce the most effective and harmonious style. Yen has said, "When you watch my films, you're feeling my heart." He believes in practical combat, and in his opinion, MMA is the most authentic type of practical combat. He has mentioned that he would have competed in the Ultimate Fighting Championship if he did not have a recurring shoulder injury.
Answer this question using a quote from the text above:

What is Yen's martial arts style?

Answer:
Yen believes that combining many martial arts together will produce the most effective and harmonious style.

Answer the question at the end by quoting:

Count Dooku of Serenno, from the House of Dooku is a fictional character from the Star Wars franchise, appearing in Star Wars: Episode II - Attack of the Clones and Star Wars: Episode III - Revenge of the Sith, as a primary antagonist. He was portrayed by Christopher Lee and voiced by Corey Burton in the animated series Star Wars: The Clone Wars and Star Wars: Clone Wars.
In the 2008 animated series Star Wars: The Clone Wars, Dooku is the leader of the Separatists. In addition to sending Grievous and Ventress on missions to antagonize the Republic, he works with the terrorist group Death Watch to give the Republic a reason to send a military presence to Mandalore, which would play in his favor. The plan falls through when Duchess Satine Kryze of Mandalore urges the Galactic Senate to hold off a military force. In the third season, Dooku is forced to eliminate Ventress to prove his loyalty to Sidious. Ventress survives, however, and works with Mother Talzin to kill Dooku by giving him Savage Opress as a replacement apprentice. During a confrontation between Dooku and Ventress, Savage turns on both. In the fourth season, after defeating Anakin in three separate lightsaber duels, Dooku gets his revenge on Ventress by having Grievous order the systematic genocide of the Nightsisters. Believing both Ventress and Talzin have been killed, Dooku knows the only threat left to him is Savage while sensing his eventual meeting with Darth Maul. In the fifth season, Dooku plays minor roles via hologram in guiding King Rash of Onderon and Grievous taking over Florrum. In the sixth season, Dooku finds out the clone trooper Tup executed Order 66 prematurely and works behind the scenes to stop the Republic's investigation. He then manipulates the Banking Clan and its representative Rush Clovis into putting all their resources in the hands of the Sith, bringing war to the planet Scipio. The Jedi find a lightsaber belonging to deceased Jedi Master Sifo-Dyas--whom Dooku murdered years earlier--and start an investigation. Sidious forces Dooku to clean up their trail. Dooku confronts Anakin and Obi-Wan on Oba Diah, revealing his alter-ego Darth Tyranus to the Jedi, and they realize that it was he who created the clone army. Some further investigation by Yoda prompts Dooku and his master to perform a Sith ritual in an unsuccessful attempt to break the Jedi Master; Dooku appears to fight Anakin in the illusion, but is executed in a manner very similar to his eventual demise.

What missions did he take part in?
In the third season, Dooku is forced to eliminate Ventress to prove his loyalty to Sidious.