Grew up playing golf at Mission Viejo Country Club, a Robert Trent Jones Sr. design which opened in 1967. The course is where 16-time PGA TOUR winner Mark O'Meara fell in love with the game as a kid. Locals call the course, "Mission Impossible."

As a junior golfer, worked with famed instructor Jim Flick, who was inducted into the World Golf Teachers Hall of Fame in 2002, followed by the PGA Golf Professional Hall of Fame in 2011. Hossler and Flick worked together for six years (ages 11-17 for Beau), until Flick passed away in 2012 (at age 82) after a battle with pancreatic cancer. Hossler said Flick was "like a grandfather to me."

Prepped at Santa Margarita Catholic High School in California. Notable alums of the high school include 2002 Heisman Trophy winner and three-time NFL Pro Bowl selection Carson Palmer (Class of 1998), as well as multi-time NBA All-Star Klay Thompson (Class of 2008).

Teammates in his three and a half seasons at Texas (2013-16) included multi-time PGA TOUR winner Scottie Scheffler (2014-16 -- two seasons), TOUR winner Cody Gribble (second half of 2012-13 season), Doug Ghim (2014-16 -- two seasons), and Kramer Hickok (2013-15 -- two and a half seasons).

Huge Los Angeles Dodgers fan.

Qualified for back-to-back U.S. Opens in 2011 (Congressional Country Club) and 2012 (The Olympic Club) while still in high school. At the 2012 U.S. Open, a 17-year-old Hossler became the youngest player to make the cut at a U.S. Open in the post-World War II era. Hossler eventually finished T29, with Jordan Spieth finishing two strokes ahead of him to take low amateur honors.

Defeated three future PGA TOUR winners in match play en route to victory at the 2014 Western Amateur. Defeated TOUR winner C.T. Pan in the Round of 16, Doug Ghim in the quarterfinals, TOUR winner Nick Hardy in the semifinals, and multi-time TOUR winner Xander Schauffele in the championship match.

Played three and a half seasons at University of Texas (2013-16; he enrolled in January 2013, the second half of the 2012-13 season), where he most notably won the 2016 Fred Haskins Award (one of the three national player of the year awards in college golf), in addition to being a two-time All-America First Team selection (2015, 2016) and two-time Big 12 Conference Player of the Year (2015, 2016).

Became the fifth University of Texas player to win the Fred Haskins Award, one of three national player of the year awards in college golf. Previous winners of the award were Ben Crenshaw (1971, 1972, 1973), Bob Estes (1987), Justin Leonard (1994), and Brad Elder (1997). Hossler's 2015-16 season featured five collegiate victories, and he finished the season with a 69.73 scoring average.

Played through a torn labrum in his left shoulder at the 2016 NCAA Championship (contested at Eugene Country Club in Oregon), with the injury occurring on the 15th hole of his semifinal match against Andrew Levitt of University of Southern California. Hossler closed out his match with a chip-in birdie at the par-3 16th (for a 2-up lead), and a par save from a greenside bunker (using a putter from the bunker) on the par-4 17th, helping Texas defeat USC and advance to the championship final. The injury sidelined Hossler for his final match, which Texas forfeited due to a substitution rule which has since been changed. Oregon defeated Texas, 3-2, and won the national title. The Longhorns' lineup featured Scottie Scheffler -- who won his match against Aaron Wise in the championship round -- Doug Ghim, and Taylor Funk, son of eight-time PGA TOUR winner Fred Funk.

Represented the United States at the 2015 Walker Cup, becoming the first Walker Cup player from University of Texas since Jordan Spieth in 2011. Also represented the United States at the 2015 Arnold Palmer Cup.

Alongside Bryson DeChambeau and Denny McCarthy, helped the United States win the 2014 Eisenhower Trophy in Japan. The Americans earned a two-stroke victory over a Canadian team featuring PGA TOUR winners Corey Conners, Taylor Pendrith, and Adam Svensson.

Represented the United States at the 2012 Junior Ryder Cup at Olympia Fields Country Club. Teammates on the U.S. team included PGA TOUR winners Cameron Champ and Scottie Scheffler.

Won back-to-back Southern California Golf Association Amateur Championships in 2013 and 2014. Earned the 2013 title with a three-stroke victory over runner-up Xander Schauffele. A year later, Hossler and Schauffele met in the championship match of the California Amateur Championship, with Schauffele taking the state amateur title at La Costa Resort & Spa in Carlsbad.

Won the 2011 Junior World Golf Championships (Boys 15-17 Division) at Torrey Pines, finishing two strokes ahead of runner-up finisher Bryson DeChambeau. Other notable players in the field included future PGA TOUR winners Nico Echavarria (T3), Si Woo Kim (6th), Adam Svensson (T10), Grayson Murray (T10), Xander Schauffele (T14), and Jake Knapp (T21).

Finished runner-up to Rico Hoey at the 2012 Junior World Golf Championships (Boys 15-17 Division).

Finished second at the 2012 California Interscholastic Federation Boys Golf Championship; he finished one stroke behind individual state champion Austin Smotherman, a Class of 2020-21 Korn Ferry Tour graduate.