Keeler Approaching Milestone Win Amid Final Season of Legendary Tri-unity Career
By
Dean Holzwarth
Special for MHSAA.com
December 18, 2024
WYOMING – Mark Keeler has spent four decades coaching boys basketball at Tri-unity Christian High School.
And while he has many stories that he shares often, one of his favorites comes from the beginnings of the program.
“We didn't have bleachers in our gym when I first started,” Keeler said. “I would make my boys set several rows of chairs up so people could watch our games. And then they eventually added bleachers that were donated by the church.”
Keeler’s teams have been filling up the bleachers since he took the reins for the 1983-84 season, and he has built the program into one of the most successful in the state.
Now, as he leads his team through the opening month of his 38th and final campaign, Keeler is nearing a rare milestone only achieved by a few. He is expected to soon become the fourth coach in MHSAA history to reach 700 wins.
Tri-unity is 3-1 this winter, making Keeler a combined 697-217 coaching the Defenders. Roy Johnston is the winningest coach in state boys basketball history with 833 victories earned during stints at Yale, Howell and Beaverton before retiring in March. He is followed by longtime River Rouge coach Lofton Greene (728) and Clarkston’s Dan Fife (703).
“It's a statement of longevity with these men,” Keeler said. “All three of them were very successful at the schools they were at and most of them spent a long time at one school, just like I’m doing now. I’ve never coached anywhere but Tri-unity, and that is quite a privilege to have been a part of this school.”
Keeler reached 697 wins with last week’s nonconference victory over Wyoming Kelloggsville and can move closer to the milestone with another Friday night against Grandville Calvin Christian. The Defenders then play East Grand Rapids and Grand Rapids West Catholic, respectively, at the Cornerstone University Holiday Classic at the end of the month.
Keeler, who retired from a 40-year teaching career two years ago, started coaching in 1983-84 when Tri-unity had only an eighth and ninth-grade team. After two seasons of playing subvarsity, the school formed its varsity team for the start of the 1985-86 season, with Keeler at the helm. After three seasons with the varsity, he took a break from coaching (but continued teaching and serving as athletic director).
“I had to get my priorities right with the Lord,” Keeler said. “I was trying to do too much and lost focus, and it was something that needed to be done. I look back, and it was something that set me up for the rest of my coaching career.”
Keeler returned for the 1990-91 season and has been at the forefront ever since. He has guided the Defenders to six state championships, including last year’s with a victory over Mount Pleasant Sacred Heart in the Division 4 Final. Tri-unity also has won titles in 1996, 2002, 2006, 2011 and 2022, while finishing as Finals runner-up six times.
Keeler’s teams also have reached the Semifinals 15 times, won 19 Regional championships, 26 District titles and 22 conference championships. His players have filled Class D and Division 4 all-state teams for years, with surely the best-known 2000 grad Chris Kaman – who went on to play at Central Michigan and 13 seasons in the NBA – and Brandon Voorhees, who led Tri-unity to the 2002 title as a senior, went on to CMU and then Park University in Missouri, and played professionally overseas.
“I’m so glad that I’ve been able to just be here this long,” said Keeler, who was inducted into the Basketball Coaches Association of Michigan Hall of Fame in 2016. “I love Tri-unity. My wife taught there, we met there, and my daughters went all the way through and graduated from there, so it's always been a part of my life. There's been so many quality people that have been there along the way.
“I've been very blessed to have had so many quality players and parents and coaches. It’s amazing when I look back at all those that have been a part of the program.”
Keeler, a man with a strong Christian faith, could’ve gone elsewhere during his career, but believed he had a calling at Tri-unity.
“I've had some opportunities to move on and go to different places, but whenever I prayed about it I always thought that this is where the Lord wanted me and that's always my priority,” Keeler said. “I want to please him first, because as a Christian that's my priority. I just thought this is where he placed me, so I’m going to set roots and do the best I can.”
Tri-unity senior guard Keaton Blanker, one of two returning starters on this year’s team, is excited to see his coach reach such a prestigious milestone.
“It’s the perfect scenario for him with this being his last year and getting to 700 wins,” Blanker said. “He’s going to leave his mark, and it’s well deserved. Being a small Division 4 school, he’s helped to put the program on the map and I remember growing up and watching his teams win state titles. I was waiting for the opportunity to play for him so I could help do the same thing.”
While Keeler is grateful for the unbridled success of the program on the court, creating lasting relationships with his players off the court and helping them grow in their faith has been equally gratifying.
“I know without a doubt that the Lord has blessed our program.” Keeler said. “There are a lot of great coaches out there that are probably better at Xs and Os than I am, but I think I’m a strong motivator and build good relationships with the players and get to know them.
“I let each player know that I want them to grow in their walk with the Lord, and that's where my priority is. To be an influence toward Christ, not away from Christ.”
Past Tri-unity standout Brent Voorhees, who has been Keeler’s assistant coach the last several years and will succeed him next season, said Keeler has never changed his approach to the game.
“Coming back to coach with him, the one thing that stands out is he doesn't waver on his principles,” Voorhees said. “A lot has changed in the sport in terms of analytics and how coaches attack things, but he has definitely stayed firm in his approach that it’s defense first and he preaches the team aspect. It’s never about an individual.
“He doesn’t let anything off the court distract him from goals. He's really good at keeping the goal in front of the guys. He keeps them focused on the goal of winning state championships and also becoming great, young Christian men in the community, which is what he stands for and always comes first.”
The Defenders graduated eight players from last year’s team, but Blanker and senior Joey Mellon are back with several newcomers as they bid to send Keeler out with one more title at Breslin Center.
“I enjoy putting them together and getting them to mesh as a team,” Keeler said. “For me, I have learned that defense wins championships. The old adage that offense wins games, but defense wins championships ... I so believe that with all my heart.”
Reporter Dean Holzwarth, a longtime member of the West Michigan media, is also the junior varsity head coach and a varsity assistant for the Tri-unity Christian boys basketball program.
Dean Holzwarth has covered primarily high school sports for Grand Rapids-based WOOD-TV for five years after serving at the Grand Rapids Press and MLive for 16 years along with shorter stints at the Ionia Sentinel and WZZM. Contact him at [email protected] with story ideas for Allegan, Kent and Ottawa counties.
PHOTOS (Top) Surrounded by celebrating players and assistant coaches (including the author, far right), Tri-unity boys basketball coach Mark Keeler (hand in pocket) enjoys a moment near the end of last season’s Division 4 championship game. (Middle) Keeler, middle, huddles with his team during the 1997 run to Breslin, when the Defenders finished Class D runners-up. (Below) Keeler raises the 2002 Class D championship trophy to the cheers of Tri-unity’s supporters. (MHSAA file photos.)
Dock Putting Dad's Coaching Lessons to Work as Middleville TK Continues Climb
By
Steve Vedder
Special for MHSAA.com
November 3, 2025
MIDDLEVILLE – Denny Dock can't pinpoint the exact moment he thought his football-loving son would follow him into coaching, but the signs were there all along.
For starters, there were the countless hours spent tossing a football around the backyard. Or when his young son, Jeff – not even old enough for middle school at the time – eagerly joined other Stevensville Lakeshore coaches watching film on weekends.
Maybe it was all those Friday nights spent trekking along the sideline as a ball boy for Lancers teams. Another clue might have been the Saturday afternoons the two spent together watching college football, or taking in the NFL on Sundays.
When Jeff got older, it may have been how he readily absorbed tips that helped him become a better quarterback in high school and then at Grand Valley State. It could have even been an early, uncanny ability to grasp the importance of fundamentals.
Put it all together, and it seemed inevitable coaching football loomed in Jeff Dock's future.
"That's very fair to say," said Denny Dock, who is 19th on the state's list of all-time winningest football coaches while also the winningest high school softball coach in the country. "The younger years in football were really positive for Jeff, and that doesn't happen all the time. There are negative things that can happen."
While there might have been multiple signs the younger Dock would one day join the coaching ranks, he admits it was far from a done deal. There were thoughts of becoming a biology teacher, a pastor or maybe even an orthopedic surgeon.
But coaching? Even with his father as a classic example of the positive impact a good coach could spread, Dock said it took years for him to eventually land in coaching.
"It dawned on me that there were a lot of all three of those things in being a coach," he said. "Growing up in sports is what I knew, and I ended up developing a passion for it."
That passion is actually the highest it's been in years as his Middleville Thornapple Kellogg football team this past weekend improved to 7-3, continuing the program's first winning season since 2020 and the best fall since the Trojans went 7-3 in 2018. The Trojans defeated Hastings 28-20 in a Division 2 playoff opener, and a win this Friday at Lowell would give Middleville its first District championship since 2001.
Denny Dock coached football at Hartford from 1981-83, Dowagiac from 1984-87, and then Lakeshore from 1988-2013, returning to lead the Lancers for one more season in 2020 and all together totaling a 270-79 career record, 15 league titles and five runner-up MHSAA Finals finishes.
He has kept his hand in football in aiding his son's Trojans program. He's at all the games to add support, critique, advice, strategy, tips on how practices can best be organized and long talks discussing how continual improvement can be furthered.
It's a two-way street as an old football coach who never had a losing season, and is a member of the Michigan High School Football Coaches Association Hall of Fame, can remain invested in the game while his son benefits from three decades worth of experience.
Jeff Dock said his father's real value is his ability to spot from the stands the little things that less experienced coaches may miss.
"Play calling, how players are used, maybe a little bit about strategy," Dock said.
After playing for his father, Dock said there's no doubt he's transferred the best of what he learned into his own coaching. The older Dock was not only a highly successful football coach, he's compiled a 1,319-345-2 record in softball with eight Finals titles.
Whether it's about football or the philosophy Dock stresses in his softball program, the advice accepted from his father – who still attends softball clinics for tips on improving the Lakeshore program – is virtually across the board. It begins, however, with how a coach should treat his players.
"I was a manager growing up, and I saw his intensity and a love of his players," Dock said. "He never pushed me in any direction, but he told me about education. He always let me figure it out. One of the coolest things my parents did in raising me was to allow me to figure things out."
As far as the Xs and Os of coaching, Dock said his father prizes an organized practice. In fact, it could even be argued that both Docks enjoy a spirited and productive practice session over the microscope of Friday Night Lights.
"He never had a losing season, and it was ingrained in us just to go back to work and that that work never stops," he said. "He loves practices and being organized. Rule No. 1 with him was to make sure the players are prepared, and that you have to communicate with them. Dad would never belittle us or cuss us out.
"I saw the work he put in, how he'd wake up every Saturday thinking about the game. I saw the nitty gritty of coaching and how it was going to take work."
It was that seemingly endless work, in fact, that Denny Dock made sure his young son understood. Denny had no illusions over the pitfalls of coaching, and the pros and the cons. But before he could teach that to his son the coach, he made sure his son the quarterback understood how athletics worked.
There were challenges as a player and now for his son as a coach.
"He was always a quarterback because I think he liked the ball in his hands," Denny Dock said. "I think he liked the leadership part of the game, understanding the team part, and knowing what he had to do. That always challenged him."
While the challenge of playing is long gone for the younger Dock, the next challenge is building a program which is annually competitive. To do that, Jeff Dock said he accepts what his father knew 30 years ago.
"I'm willing to learn anything from anyone at any time," he said. "I know my dad has always thought about what he can do to become a little better every year. I'm always looking for ways to communicate and do things better. It can always be done better, but how can you get there? How can we do the little things better. That's what I learned."
PHOTOS (Top) Jeff Dock, left, and son Micah – Middleville Thornapple Kellogg’s quarterback this season – stand for a photo at their home field. (Middle) Denny Dock, far left, coaches a base runner during Stevensville Lakeshore’s 2022 Semifinal win. (Top photo by Steve Vedder.)