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2020 Coaching Staff

Matt McDonnell

Head Coach

Coach McDonnell- also known as Coach Mac has been coaching football for 7 seasons, six in the high school ranks. He has been on the Laser staff since 2018, where he joined as the defensive coordinator. In 2019 he was promoted to Head Coach. In his first season, he helped guide the Lasers to the playoffs for a school tying 3rd straight year, and marquee victories over CMH and Arrowhead.  He strives to run a player-centered program and wants everyone to experience what football has to offer. Coach Mac has an extensive coaching background, having coached in Florida, Mississippi, and Ohio. During his six years of coaching high school, his position group has had 20 all-conference players, 8 all-area, 4 all-region, and 2 all-state players. He also played a major role in helping Olive Branch HS in Mississippi turn around the program from 0-11 to 12-2 in just one season, finishing 3rd in the state. Coach Mac also spent 3 years in video work at Wisconsin-Whitewater and spent a year with Hiram College in Ohio.

Coach McDonnell married his wife Allie in July of 2017. They had their first child, Myles, in August of 2019.  Coach Mac is a special education teacher at Kettle Moraine Middle School. 

You can follow Coach Mac on Twitter: @coach_mcdonnell and email him at if you have any questions or want to talk about the Laser Football Program.

Chad Buchholz

Defensive Line

Coach Buchholz is in his 10th season coaching for Kettle Moraine.  He coaches defensive line for our Lasers and 7 of those 10 years have been at the varsity level.  During those 7 years, Coach Buchholz has coached 14 All-Conference, 5 All-Area, 2 All-Region and 1 All-State athletes.  Coach Buchholz played high school football at Port Washington from 1990-1993. He continued his football playing career at Carroll University from 1993-1997 where he was awarded Team Captain as well as earning 1st Team All-Conference honors at defensive end.  The Pioneers went on to become Conference Champs that year. Coach Buchholz also coaches softball at Kettle Moraine.  

While attending Carroll University Coach Buchholz earned his BS in Education while minoring in Early Childhood.  He quickly went on to earn his Masters in Education through Aurora University. Right out of college, Coach Buchholz landed a teaching position in kindergarten at Cushing Elementary.  He is currently in his 21st year teaching at Cushing. In 2016, Coach Buchholz became a published author with a math unit called Shaping Up the Yard.  Just this year, Coach Buchholz was also awarded the Innovator of the Year award for Kettle Moraine.  He lives in Waukesha with his wife Christa and two children, Claudia and Cade.

Coach Buchholz can be reached at 

Kevin Yarbrough

Coach Yarbrough, also known as Coach Yarby, is entering his 8th year coaching football and track at KM. During his tenure at KM, Coach Yarbrough has served as QB’s coach, WR’s coach, RB’s coach, freshman head coach, JV offensive coordinator and Varsity offensive coordinator. Since arriving at KM coach Yarbrough has coached multiple All State, All Region and All Conference players. In 2014 Coach Yarbrough was selected as the Classic 8 Offensive Assistant Coach of the Year and WIAA SE Region Offensive Assistant of the Year.

This will be Coach Yarbrough’s 20th year coaching varsity football in Wisconsin with previous coaching stints at Brookfield East, Mukwonago, Waukesha North, and LaCrosse Logan. He graduated from UW - LaCrosse with a degree in Exercise and Sport Science and teaches PE at Wales Elementary. Coach Yarbrough is originally from Oklahoma where he graduated from Westmoore HS and went on to play football at the University of Oklahoma before transferring to UWL. Coach Yarbrough played football and ran track while at UWL, earning All American honors in track and field and helping capture a national championship in 2001.

Coach Yarbrough is married to his wife Sarah and they have three beautiful kids; Everett 10, Adeline 8, and Leila 5. 

You can follow Coach Yarbrough on twitter: @yarby03 if you have questions about Laser football you can email him 



Jerry Boll

Coach Jerry Boll is entering his second season coaching for the Lasers - primarily working with defensive backs. Coach Jerry played within the classic 8 conference during his high school years at Catholic Memorial (2007-2011) before earning a scholarship to play at Division II Concordia - Saint Paul, where he played strong safety for the Golden Bears (2011-2013). After two years at CSP, coach Jerry transferred to UW-Whitewater where he earned his degree in Marketing & Advertising.


Dan Emanuele

Coach Dan Emanuele - also known as Coach E starts his second season coaching with the Lasers focused on Offensive and Defensive Line.  Coach E played HS football in Foxboro, MA where he was a 3yr All Conference Player and Selected to the Shriners All State Team his Senior year.  Following HS Coach E went on to play at Wagner College in NY (Div 1 FCS) as a scholarship athlete for Football and Track & Field. During this time playing at Wagner he earned a starting position as a Freshman at Right Tackle and then transition to Center his Junior year having finished starting in 42 of 44 games.  He was an NEC all Conference Selection (Junior and Senior year), Pre-Season All American, Selected for the NCAA Leadership Council and Elected Captain of the team his Senior year.

Graduating in 2005 with a Bachelor Degree in Business Management and a Minor in Psychology, Coach E started his career in Telecom sales before transitioning to Cyber Intelligence and has been in that field for the past 12 years.  The passion for football never left after college and once settling in Genesee Depot, WI he decided to get more involved in the community and started coaching in the summer of 2019.

Coach E can be reached at or 262-225-3718

Ian Dretzka

Coach Ian Dretzka began his first football season as the Offensive line coach. His duties also include the Offensive Coordinator for the Junior Varsity team.

Coach Dretzka is a proud graduate of Kettle Moraine High School from 2015. He is a recent graduate of the University of Wisconsin-Madison. He earned a bachelor’s degree in Agriculture and Applied Economics. While Studying at UW, he played 2 seasons with the Badgers Football team at several positions including right guard, left guard, center and right tackle. After football, he continued his athletic career by walking onto the wrestling team and finishing his season at 7-4.

Coach Dretzka not only coaches football for the Lasers, but wrestling as well. He is very excited to be a part of the program under Coach Mcdonnell and looks forward to assisting in the weight room as a strength and conditioning coach. He currently lives in his recently purchased home in Oconomowoc with his girlfriend, Savannah.


Joe Barriere

Coach Joe Barriere is entering his second year coaching Wide Receivers at Kettle Moraine.  Coach Barriere played two years at Greendale High School before his playing career was unfortunately cut short due to medical injury. Those injuries did not keep him from the game he loves.  During his junior year of high school, Coach Barriere joined the Greendale youth football staff and continued to coach for another 4 years. While attending Edgewood College, Coach Barriere was the Quarterbacks and Wide Receivers coach for two years at Sauk Prairie High School. 

After a short hiatus working in many different professions, Coach Barriere is currently working as a Paraeducator at Kettle Moraine High School. Coach Barriere currently resides in Waukesha with his wife Carissa and two dogs. 

Coach Barriere can be reached via email at


Mike Hilliard

Coach Mike Hill is entering his second year coaching at Kettle Moraine. Last year, Coach Hill coached the tight-ends but this year he’s making the transition to the running backs coach. Coach Hill was apart of the Lakeland University Muskies located in Plymouth, Wi, for five years. Coach Hill has played football since he was seven years old up until his last season at Lakeland in 2018. He plans to become a college coach one day to continue his dreams of being around the game of football.

Coach Hill can be reached via email at:
Or by cell: 313-888-2804


Coach Martinez

Coach Martinez is heading into his second year as the inside linebacker coach at Kettle Moraine.  Coach Martinez continued his playing career at Monmouth College where he played linebacker for one year before transferring.  He then graduated from Lakeland University with his BA in Biology in 2019 where he played football for three years, a member of a team which won two conference championships and back to back playoff appearances.  Coach Martinez currently lives in Oconomowoc with his fiancee Kaitlyn.  


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