Sean Smith, Director & Head Coach

Sean Smith is in the 9th year of his coaching career and will lead our 15s division this season. Over the course of his career, Sean's teams have consistently qualified for Nationals including 10 total bids to Nationals. Leading our 18s division, Sean teams have all qualified with two Open bids and two National bids including this season. Sean's 13 White team achieved our highest ever qualification for White team with a National bid in 2016. Sean was an assistant on our first National Championship in the 15 American Division in 2013 with Head Coach Meghan Gray.
Sean's success as a coach is a natural extension of his connection to the game. Sean's parents met playing sand volleyball and are both huge supporters of his teams. He grew up playing at a time when Boy's Volleyball was an afterthought in the region, but still developed into a highly sought after player who attended California Baptist University to continue his playing career. He also had a playing stint at Hannibal LaGrange before returning home to Dallas where he has been coaching ever since. Sean's success as a player comes from his ability to read the game and make great decisions. He is a disruptive blocker with a well known lethal serve. Sean's abilities to set and train setters has been a key component of the development of many setters who have come through the club including 16W Assistant Coach Riley Duzenack (Mississippi State).
Sean is a visible member of the adult volleyball community on the sand as well as the indoor side of the game. Volleyball is truly a family affair with his parents still competing themselves. His brother, Trevor Callarman, is the Head Coach at University of Maryland Eastern Shore. His sister Alyson Grevsmuehl competed for Excel including playing for Sean at 16W in a special season including a USA Qualifier Championship at Northern Lights. Alyson also now coaches for Excel as well.

Iris Miranda, Head Coach

Iris Miranda is USAV CAP1, CAP 2 and IMPACT certified and has over 17 years of volleyball experience both as a player and as a coach.  Coach Iris joined EXCEL in 2014.  

Iris’ volleyball career started in her home town of El Paso where she earned distinction as one of the top Outside Hitters in the city.  She also played club volleyball at the University of Texas – Dallas in the Southern Intercollegiate Volleyball Association.  Iris continues to play at a high level, currently playing in local adult leagues and tournaments.

Iris was also an accomplished soccer player, having played collegiately at Richland College.  Iris holds a Bachelor of Science degree in Child Learning and Development, which she believes has helped her develop stronger athletes, both physically and mentally.   Iris is a proud mother of 2 boys! Ace and Dax ! 

In 2021, Coach Iris’s 14 white team finished 7th at NTR regionals. Missing the bid after losing to 2 NTR top teams. Her 14s fought very hard this season. This team according to Iris is one of hardest working team she has ever coached! 

In 2020, Coach Iris’s 13 blue team season was cut short due to COVID-19 Her third team finished 42 in the region. 

In 2019, Coach Iris’s 12’s finished 4 at regionals and 8th in the NTR rankings. They earned an American bid and finished with 7-2 record at Nationals!

In 2018, Coach Iris's 12’s finished top 5 at both Lonestar and Big South National Qualifiers in the National division. 

Her 12s won the coveted gold ball Northern Lightsf National Qualifier in Minneapolis, not dropping a single set! This Championship win earned them the gold ticket to nationals in Detroit in June. Finishing the season ranked 6th in NTR’s competitive ranking.

In 2017, Coach Iris finished 6th in both Big South and Northern lights qualifiers playing in highest division for her young 12u team. Her 12u team fought at regionals and finished 5th, missing the bid by 1 spot. 

In 2016, Coach Iris led her team to win Regionals and qualify for USAV Nationals, finishing 9th in the National division. Finished with a 9-1 record at the USAV National Championship tournament. 

In 2015, her 11U team earn the sought after gold ball finishing first at Lone Star.  The team went on to also win Regionals and finished in the top 8th at the USAV National Championship. 


Bonnie Vernon, Head Coach

Bonnie will start her fourth year coaching for EXCEL.  She has coached 18N Red, 18N White, 16N Red and 11 White over the years.  Most recently, Bonnie was part of the coaching team that qualified 18N Red for the Girls Junior National Championships where they finished 5th overall in the Nationals division.  Bonnie has also been the head JV coach at Bishop Lynch High School for the past four years, leading them to an undefeated season this past year!
Bonnie played volleyball in college for the University of Central Oklahoma. Won conference in 2015. Awarded All-Conference Outside Hitter and All-Conference Defensive Specialist. Academic All-Conference.
She played club for 6 years for the region's top clubs. Qualified for Nationals all 6 years. Was a 4-year Varsity Letterman for Lake Highlands High School. Named All-District First Team Outside Hitter Sophomore, Junior, and Senior year. Vype Magazine Top 100 Volleyball Watch-List. 

Mark Graham, Head Coach

Mark has been with Excel since 2018 and has coached since 2010 with experience at LoneStar and
Knights prior to Excel. Mark helped develop athletes of all ages and was the Head Coach for ages 13s-16s
throughout his coaching tenure. In 2018 Mark assisted 18 White and helped them qualify for Nationals
that year. Mark also is a JV Head coach and Varsity Assistant coach at Coram Deo Academy.

Mark is very active at Courtside helping out in most clinics and camps over the summer and is currently
leading Excel’s Rookie Minor/Major program for the second year. Mark also has two daughters that play
for Excel.

Prior to coaching, Mark played for a USAV Men’s team as a middle blocker and more recently a right-
side hitter and setter. Mark played and captained a volleyball team in the Richardson Corporate
Challenge for Hilton where they have medaled each year he has played on the team. Mark also played
competitive sand volleyball for many years.

Mark believes focusing on the fundamentals of the game are pivotal in creating lasting discipline.
Playing sports as a child builds character and confidence and prepares them for life as they learn to work
as part of a team. Mark hopes to foster an environment that encourages athletes to learn and develop
on and off the court.