Question: The 2013 documentary "I Know That Voice" featured what famous actor, known for voice roles as Cindy Lou Who and Rocky the Flying Squirrel?

Context articles: Travancore flying squirrel
Ray Dennis Steckler
Long-eared flying mouse
Rocky the Flying Squirrel
I Know That Voice
Namdapha flying squirrel
Sumatran flying squirrel
June Foray
Alex Anderson (cartoonist)
Sylvio Sarkis

Travancore flying squirrel ("Petinomys fuscocapillus"), also known as the small flying squirrel, is a flying squirrel found in South India and Sri Lanka.
 Travancore flying squirrels were thought to be extinct but were rediscovered in 1989 after a gap of 100 years in Kerala.
 It was rediscovered in Sri Lanka after 78 years.
 The animals were reported only in wet and intermediate zones of the island, and had a few sightings in the Sinharaja Forest Reserve.
Ray Dennis Steckler (January 25, 1938 – January 7, 2009), also known by the pseudonym Cash Flagg, was an American film director, producer, screenwriter and actor best known as the low-budget auteur of such cult films as "The Incredibly Strange Creatures Who Stopped Living and Became Mixed-Up Zombies".
 In addition to Cash Flagg, Steckler was also known by the pseudonyms Sven Christian, Sven Hellstrom, Harry Nixon, Michael J. Rogers, Michel J. Rogers, Wolfgang Schmidt, Cindy Lou Steckler, R.D. Steckler, Ray Steckler, and Cindy Lou Sutters—the last being his "porn name".
The long-eared flying mouse ("Idiurus macrotis"), or long-eared scaly-tailed flying squirrel, is a species of flying mouse from western and central Africa.
 It is not actually a :squirrel, nor a :mouse, though it is a rodent.
 Not much is known about them because they are very hard to keep alive in captivity.
Rocket J. "Rocky" Squirrel is a plucky flying squirrel and one of the two protagonists of the 1959–1964 animated television series "Rocky and His Friends" and "The Bullwinkle Show" (both shows often referred to collectively as "The Rocky and Bullwinkle Show"), produced by Jay Ward.
 Rocky is the best friend and ally of the western moose, Bullwinkle.
 Both Rocky and Bullwinkle were given the middle initial "J" as a reference to Ward.
I Know That Voice is a documentary about American voice acting.
 It premiered on November 6, 2013, at Grauman's Egyptian Theatre.
 It is narrated by John DiMaggio, the voice of Bender on "Futurama" and Jake on "Adventure Time", and stars DiMaggio and many other voice actors, including Billy West, Tara Strong, Tom Kenny, Grey DeLisle, June Foray, Rachael MacFarlane, Mark Hamill, Ed Asner, Robin Atkin Downes, and Pamela Adlon.
The Namdapha flying squirrel ("Biswamoyopterus biswasi") is an arboreal, nocturnal flying squirrel endemic to northeastern India, where it is known from a single specimen collected in Namdapha National Park in 1981.
 It was the sole member in the genus "Biswamoyopterus" until the description of the Laotian giant flying squirrel ("Biswamoyopterus laoensis") in 2013.
 No population estimates are available for "B. biswasi", but the known habitat is tall Mesua ferrea jungles, often on hill slopes in the catchment area of Na Dihing river (particularly on the western slope of Patkai range) in North eastern India.
The Sumatran flying squirrel ("Hylopetes winstoni") is a flying squirrel only found on the island of Sumatra.
 It is listed as data deficient on the IUCN red list.
 Originally discovered in 1949, it is known only from a single specimen.
 It is a nocturnal, arboreal creature, spending most of its life in the canopy.
 The Sumatran flying squirrel is threatened by a restricted range and habitat loss due to logging.
June Foray (born June Lucille Forer; September 18, 1917 – July 26, 2017) was an American voice actress who was best known as the voice of such animated characters as Rocky the Flying Squirrel, Lucifer from Disney's "Cinderella", Cindy Lou Who, Jokey Smurf, Granny from the Warner Bros. cartoons directed by Friz Freleng, Grammi Gummi from "Disney's Adventures of the Gummi Bears" series, and Magica De Spell, among many others.
Alexander Hume Anderson Jr. (September 5, 1920 in Berkeley, California – October 22, 2010) was an American cartoonist who created the characters of Rocky the Flying Squirrel, Bullwinkle, and Dudley Do-Right, as well as Crusader Rabbit.
 He was not directly involved in "The Rocky and Bullwinkle Show", however.
Sylvio Sarkis is a Lebanese actor born on the 28th of September 1998.
 His career started in 2008 when he participated in the hit Lebanese series "Mou’abbad" along with the much known actors Badih Abou Chakra and Patricia Nammour.
 Sylvio Sarkis had worked over the past 9 years in 7 hit series such as: "Mou’abbad (Mou2abbad)", "Badal An Dayeh (Badal 3an Daye3)" with famous actor Youssef El Khal and Nelly Maatouk, "Ala El A’aehed (3ala Al 3ahed)" with Famous Actress Darine Hamze and Talal El Jurdi where Sylvio was one of the three main characters in the series.
 "Ayli Mat’oub Alaya (3ayle Mat3oub 3laya)" along side with the late actor Issam Breidy and actress Yara Fares.
 The hit Series "Helwe W Kezzabi (Beautiful Liar)" with the famous actress Dalida Khalil and famous singer Ziad Bourji.
 "Joumhouriyet Noun" with famous actor Youssef Haddad and famous actress Rita Harb.
 "50 Alef (50 thousand)" with famous actor Tony Issa and famous actress Dalida Khalil which was his second collaboration with her as being co-actors and main characters.