|Date of birth||February 8, 1971|
|Place of birth||Orange, California, United States|
|Height||6 ft 3 in (1.91 m)|
|1990–1993||Cal State Fullerton Titans|
|1989||Los Angeles Heat||2||(0)|
|1993||East Los Angeles Cobras|
|1996–1998||Kansas City Wizards||60||(0)|
|* Senior club appearances and goals counted for the domestic league only.
In 1989, Ammann, younger brother of Bob Ammann, played for the Los Angeles Heat in the Western Soccer League. In 1989, Ammann graduated from Mater Dei High School. He entered Cal State-Fullerton where he played on the men's soccer team from 1990 to 1993. In 1993, the Titans went to the NCAA Final Four. That year, uhe also played for the East Los Angeles Cobras in the USISL.
In 1994, Mike Stevens, the director of Charlton Athletic F.C. saw Ammann play in the NCAA Final Four. He contacted Ammann and offered him a trial with Charlton. Ammann played for Charlton Athletic from 1994 to 1996. When Major League Soccer started in 1996, Ammann signed with the then-Kansas City Wiz late in the inaugural season. In 1997, he set a league record (since broken) of twenty-one wins. Before the 1999 season, Ammann was traded to the MetroStars with Mark Chung for Tony Meola and Alexi Lalas. That season the MetroStars squad finished with the worst record in league history. However, Ammann played well despite the lack of success and was named Defensive Player of the Year two seasons in a row.
The 2000 season was Ammann's best as the Metros went through a rebirth. Ammann was selected to the 2000 MLS All Star game and starting in goal for the Eastern Conference. However, Ammann missed the last five weeks of the season after an incident involving Mamadou Diallo. In a game against the Tampa Bay Mutiny, Diallo stepped on the Metro goalie, breaking three ribs, puncturing his lung, and giving him a concussion. The incident, which was dubbed "Crime of the Century" by Metro teammate Mike Petke, saw Diallo receive no punishment. Ammann, on the other hand, had to miss the rest of the regular season, returning for the playoffs and shutting out the Chicago Fire 2-0.
With the emergence of Tim Howard for the MetroStars, Ammann was traded to D.C. United for Richie Williams and an allocation before the 2001 MLS season. Injuries dogged him, however, and he retired after not playing a minute in 2002. Ammann's doctor had never performed the procedure prior to operating on Ammann and left him permanently disabled. Ammann suffers disabilities in his right and left arms and hands. Dr. Hazel was found guilty by a jury of Malpractice in D.C. Courts.
Since 2003, Ammann worked in information technology and became the director of channel sales at Tintri. Ammann worked for Hitachi, ViON and EMC. In 2010, Ammann founded Twenty-Four Seven Goalkeeper, a goalkeeper academy in the Northern Virginia area, which taught both boys and girls of all ages. Ammann then merged 247GK with GK Icon and founded GK Icon USA some time before 2013.
- 1989 Western Soccer League Standings
- Mater Dei Goalie Ammann to play soccer for Titans
- Soccer365 Interview
- Travis Clark. "What Ever Happened To: Mike Ammann". Twenty-Four Seven Goalkeeper web site. Retrieved October 7, 2016.
- "Staff: Coach: Mike Ammann". Archived from the original on September 17, 2013. Retrieved October 7, 2016.