Question: Who was the director of the 1930 romantic film starring a five-time Olympic medalist in swimming?

Context paragraphs:
Ian Crocker: Ian Lowell Crocker (born August 31, 1982) is an American former competition swimmer, five-time Olympic medalist, and former world record-holder.  During his career, he set world records in the 50- and 100-meter butterfly (long course and short course) and the 100-meter freestyle (short course).  He has won a total of twenty-one medals in major international competition, spanning the Olympics, the FINA World Aquatics Championships, and the Pan Pacific Swimming Championships.

Girl of the Port: Girl of the Port is a 1930 romantic film, directed by Bert Glennon, from a screenplay by Beulah Marie Dix with dialogue from Frank Reicher.  The film was based on a short story, entitled "The Fire-walker" by John Russell, and starred Sally O'Neil, Reginald Sharland, Mitchell Lewis, and Duke Kahanamoku.

Max Whitlock: Max Antony Whitlock MBE (born 13 January 1993) is a British artistic gymnast.  He is a five-time Olympic medalist (all around, team, floor exercise and twice on pommel horse), winning two golds and three bronzes, and a five-time world medalist on the same apparatus with one gold and four silvers.  He became Britain's first ever gold medalist in artistic gymnastics when he won both the men's floor and pommel horse exercises at the 2016 Summer Olympics.  With ten medals and three titles in Olympic and world championships, Whitlock is the most successful gymnast in his nation's history.

Ian Thorpe and drug testing: Ian Thorpe, an Australian freestyle swimmer and five-time Olympic gold medalist, has been targeted in the 2000s for criticism alleging his athletic achievements have been fueled by the use of performance-enhancing drugs, and steroid drug doping.  Despite numerous tests no proof of these allegations has ever materialized, Thorpe has steadfastly denied the allegations, and he has been a prominent critic of the drug policies used by the World Anti-Doping Agency and FINA, the governing body of world swimming as being too lax, and poorly conducted.

Mal Whitfield: Malvin Greston "Mal" Whitfield (October 11, 1924 – November 19, 2015) was an athlete, goodwill ambassador, and airman.  Nicknamed "Marvelous Mal", he was the Olympic champion in the 800 meters at the 1948 and 1952 Summer Olympics, and a member of the 1948 gold medal team in the 4 × 400 meters relay.  Overall, Whitfield was a five-time Olympic medalist (three gold, one silver, one bronze).  After his competitive career, he worked for forty-seven years as a coach, goodwill ambassador, and athletic mentor in Africa on behalf of the United States Information Service.

Duke Kahanamoku: Duke Paoa Kahinu Mokoe Hulikohola Kahanamoku (August 24, 1890 – January 22, 1968) was a Native Hawaiian competition swimmer who popularized the ancient Hawaiian sport of surfing.  He was born towards the end of the Kingdom of Hawaii, just before the overthrow, living into statehood as a United States citizen.  He was a five-time Olympic medalist in swimming.  Duke was also a law enforcement officer, an actor, a beach volleyball player and businessman.

John Naber: John Phillips Naber (born January 20, 1956) is an American former competition swimmer, five-time Olympic medalist, and former world record-holder in multiple events.

Galina Gorokhova: Galina Yevgenyevna Gorokhova (Russian: Галина Евгеньевна Горохова ; born 31 August 1938) is a Russian and former Soviet retired fencer and five-time Olympic medalist, as well as a nine-time world gold medalist.  She is also the coach of the Russian Olympic fencing team.

Tom Jager: Thomas Michael Jager (born October 6, 1964) is an American former competition swimmer.  He is five-time Olympic gold medalist in relay events, a two-time World Championship individual gold medalist for the 50-meter freestyle, and a former world record-holder in two events.  Jager set the 50-meter freestyle world record on six occasions during his career.  He held this record for over ten years from August 1989 to June 2000.

François-Louis Tremblay: François-Louis Tremblay (born November 13, 1980, in Alma, Quebec, Canada) is a retired Canadian short track speed skater and five-time Olympic medalist who competed at the 2002, 2006, and 2010 Winter Olympics.

Supporting paragraphs: Girl of the Port Duke Kahanamoku
Answer: Bert Glennon