For more information see below:




Aggressiveness starts with DEFENSE. We tell our players to have a level of WORRIEDNESS or EDGE, as I like to call it, on the defensive end. ALL 5 players have to do their job for US to be successful.  On the offensive end, we need to be in attack mode all the time, ALL 5 of us. Now, attack mode doesn’t mean GO. It means be aggressive, productive and efficient in attacking a defense. Offense is all about reading what the defense is giving you. READ and REACT.


If we are not disciplined on and off the court then we will not be successful. On the defensive end, we need to be in the right spot at the right time. If we are not then the whole system fails. I have your back and you have mine. TRUST is a crucial piece of discipline. The simple and little things we emphasize will go a long way. On the offensive end, we are disciplined in our movement/spacing. We get others open because it is beneficial for the team. Off the court have a level of discipline in the classroom.


This is the most important piece to our program. LOVE THE GUY NEXT TO YOU. Love goes a long way. If you love and care for your teammates good things will happen. Win or lose, Great times or Bad times, I will RIDE or DIE with my teammates.  We look out for each other like brothers do. Off the court chemistry and togetherness will lead to success on the court.



Riley Grabau, Head Coach Boys Basketball

Riley Grabau graduated from Boulder High School in 2011. Coach Grabau played Division I basketball at the University of Wyoming and graduated in 2015 with a degree in Criminal Justice.

Coach Grabau was the varsity assistant for Boulder High basketball during the 2017-2018 season, and also coaches wide receivers for the Panthers football team.

During his high school career Grabau won 2 state championships at Faith Christian his freshman and sophomore year.  He transfered to Boulder HIgh his junior season and led the Panthers to the Sweet 16.  His senior year Boulder High finished with a 25-3 record, losing to Regis in the state championship.  He was the CHSAA All-State Player of the Year,  the state tournament MVP, and was selected as Mr. Basketball Colorado.

At the University of Wyoming Coach Grabau was a 3 year starter at point guard and led the NCAA in free throw percentage his senior year.  The Cowboys won the Mountain West Tournament his senior year and were selected to the NCAA tournament.

After college Coach Grabau played professionally overseas in Scotland for the Glascow Rocks of the British Basketball League.

The Grabau Family has a strong Boulder High Basketball tradition.  His father Craig won a state championship in 1977, his Aunt Diane won in 1986 and his uncle Dan was a state runner-up in 1980.

Coach Grabau's coaching philosophy is "ADU",  Aggressive, Discipline, Unselfish.  His focus is on developing young men on and off the court, teaching them the game of basketball, as well as hard work and love for the game.

Sean Roth

Sean Rothermel, JV Head Coach Boys Basketball

Sean Rothermel is entering his fifth season in the BHS boys basketball program. Sean graduated from Delaware Hayes High School in 2009, located 30 miles north of Columbus, Ohio. Upon graduation from high school Sean played collegiality at the NCAA Division III level at Baldwin Wallace University. At Baldwin Wallace he was a 4 year letter winner, first team academic all OAC his senior season and a team captain his senior year. At Baldwin Wallace University Sean was a history major with minors in education and political science. He completed his degree in 2013 and obtained his teaching license certified to teach integrated social studies grades 7-12.


In 2013 Sean moved to Colorado to teach at Temple Grandin School, a school specialized in teaching students with high functioning autism. This school year Sean is entering his 6th year at the school as a social studies teacher and director of after school programming.


In 2014 Sean began coaching at Boulder High School at the Sophomore level. He is currently the JV coach. Sean’s coaching philosophy stretches beyond teaching students the game and is focused on teaching students skills that will make them successful in the game but more importantly skills that can be used in life beyond high school basketball.

Keegan Johnson

Keegan Johnson, Lower Level Boys Basketball Coach


Keegan Johnson graduated from Monarch High School in 2018. Currently, Coach Johnson is working on his undergraduate degree in the Leeds Business School at University of Colorado with an emphasis in Marketing. He is in his second year of studies.


Keegan was an assistant basketball coach for the Colorado Titans Basketball club program. He helped work with the ten-year old’s as well as the sixteen-year old players. This experience gave him the opportunity to coach in California, Portland, and Seattle in 2019.


While at Monarch High School, Keegan brought Monarch their first 5A playoff win since 2013-2014 season. Being a three-year varsity player, Keegan set the school record in overall steals and season steals. Junior and Senior year he was top five in state in steals, while making Second Team All-Conference both years. He was also recognized by the state in First Team All-State Academics with a 4.29 GPA.


During his club career, Coach Johnson earned a spot every year on the top team in the Titans program. His last season, the team made it to the elite eight in the top bracket in Las Vegas, a national tournament, and won another national tournament in California.


Academics and basketball helped Keegan grow quickly into a coaching position and student in a top twenty nationally ranked business school.


Coach Johnson strives to build players in character and creating a culture of passion and support. The development of these young men into upstanding Boulder High School student athletes is a key mission in his coaching perspective.

Ryan Bishop

Ryan Bishop, Lower Level Boys Basketball Coach

Coach Bishop has been part of the Boulder High football program for several years, and has coached middle school football as well. He has taught Language Arts and AVID at Boulder High school for 10 years. He has also coached boys and girls basketball, boys and girls track, and boys and girls golf. He is a coordinator of the school's Panther Pride program. He is lucky enough to have a solid support system with his wife, Jessica, daughter, Elia, and son, Cooper.


Austin Kellogg, Assistant Coach Boys Basketball

Coach Kellogg is a Colorado transplant since 2013, arriving from Ohio by way of Tennessee. A lifelong student of the game, he draws on diverse playing and coaching experience from a broad range of schools, states, and countries. Graduating from Vanderbilt University, he participated in the basketball program and played for his University while studying abroad in Madrid, Spain. Additionally, he played for the Scottish National team in high school.

His coaching philosophy emphasizes hard work, successful team dynamics, and intelligent play. He has coached in a wide variety of levels and settings, and brings an open-minded, flexible perspective to the game. In addition to coaching, he assists hopeful college applicants in their efforts to improve their standardized test scores. Using sports as a meaningful frame of reference and motivator, Coach Kellogg has been fortunate to see both students and athletes build bright futures through their hard work and perseverance.