2018 Coaching Staff

Heidi McMillan - Head Coach 

With 19 years of coaching experience, Heidi is excited to be part of Dana Hills as a co-head coach. Heidi has a unique background of coaching both summer rec programs and USS for the Aquabears.

Her love for swimming began at Scottsdale swim club. Heidi loves rec swimming and has amazing memories of friendship, fun, cheers and rituals. She swam for Aquabears in high school and BYU in college, where she was a team captain, conference record breaker, Academic All American, and nominated for the Leona Holbrook Award, given to a senior female athlete who best exemplifies the true spirit of sport in athletics and life.


She is excited to bring her passion and knowledge of swimming to the Otters. She provides a great technical background and believes that swimming correctly, working hard and having fun leads to successful swimmers and individuals. She loves all the life lessons learned through swimming and is excited for another great year with the Otters!

Aaron Mikuni - Head Coach 

Swimming has been a lifelong passion for Aaron.  He grew up swimming for the Ygnacio Wood and the Terrapins Swim Team in Concord.  Aaron earned his bachelors degree from the University of Hawaii at Manoa, where he was also a member of the swim team.  He went on to finish his teaching credential at Chapman University and currently teaches Physical Education at Diablo View Middle School in Clayton.

Aaron has coached for local swim teams such as Rudgear Estates, Terrapins and Valley Vista for 18 years.  While some of Aaron’s success as a head coach may be measured in City Meet wins, his philosophy is founded on the balance of proper technique, hard work, and fun.  He believes the most important part of recreational swimming is the family and friends met and created throughout the years.

In his free time, Aaron enjoys keeping active; surfing, golfing and swimming with the Walnut Creek Masters team.

Dan Cottam - Assistant Head Coach 

Dan Cottam has been coaching for two decades at the USS club, recreational, and high school level. Dan is currently the Senior Development Group coach and Assistant Senior Group coach for the Terrapins Swim Team as well as the Head Coach of Carondelet High School.  In addition, he was the co-founder/Head Coach for the Diablo Aquatics Devil Rays where he coached for 7 months (June 2015-December 2015). Dan was also the co-founder/ Head Coach for the Crow Canyon Sharks (2005-2015). Dan led the Sharks to 5 Silver Medal National Club Excellence Awards (2010-2014) and 1 Bronze Medal National Club Excellence Award (2015).

His coaching accomplishments include: coached at 2 Olympic Trials (2008, 2012) and had a semi-finalist in each one, a Top 5 Team finish at the 2011 and 2012 Short Course Junior National championships, multiple individual Junior National Champions and a Junior National Record breaking 400 Medley Relay Team, a LC Sectional Team Title and Coach of the Meet (2014), a Far Western Team title (2010 LC), multiple Top 3 Team finishes at Short Course Far Westerns, 5 Junior Olympic Team titles (3 Short Course, 2 Long Course), multiple individual Pacific Record breakers and relay record breakers, multiple individual/relay Far Western and Junior Olympic Champions, and has prepared 70 kids to swim at the college level.

Dan also served as Pacific Swimming All-Star Coach in 2008 and Head Coach in 2009. He has also been nominated for Pacific Swimming Senior and Age Group Coach of the year. Dan was Co-Head Coach of the Crow Canyon Sea Lions summer team and helped lead them to Contra Costa County titles from 2005-2008. Additionally, Dan was the Athletic/Aquatic Director for Crow Canyon Country Club (2004-2015). Previously, he served as the Head Coach of the men’s and women’s swim teams at Acalanes High School in Lafayette (2005-2007). Dan directed the Dons’ squads to Top 10 finishes in the CIF North Coast Section all 3 years (3rd place with Men’s Team in 2007). Dan began his coaching career with LMYA Swim Team where he was an Assistant Coach for 2 years and then Head Coach from 2002-2004.

The East Bay native started swimming at 5 years old (Forrest Park Swim Club) and began year round swimming with the Terrapins at 9 years old and continued with them through college (14 years, 1986-2001). At the Terrapins Dan was a Junior National qualifier in the Distance Freestyle events and also specialized in the 200FL and 400IM. Dan earned a swimming scholarship to the University of California at Santa Barbara where he was a four-year member of the Gauchos swim team, won conference title in the 1650 yard freestyle as a freshman, and also won Most Inspirational Swimmer Award (2001).

Anthony Vines - Assistant Coach 

Swimming and Dana Hills has been a major part of Anthony's life. Having been involved in competitive swim for 12 years and Dana Hills for 10 years, Anthony is excited for his fifth season coaching the otters. Many of Anthony's closest friends and fondest memories were made on the pool deck.


Having swam for the otters for nine years, Anthony was a county qualifier each season with the otters. He currently holds five team records; three in the boy's 13/14 50 freestyle, 50 butterfly, 200 freestyle relay and the men's 15/18 100 yard butterfly and 400 freestyle relay. Anthony's swim career at Clayton Valley Charter High School also included multiple top ten times including: 3rd fastest in the 50 free, 7th in the 100 butterfly, and multiple relays. In addition, he was a two time NISCA all American, athlete of the year, and one of the first swimmer's in school history to attend the CIF State Swimming Championships. 


Currently, he is a second year student at UCLA studying Financial Actuarial Mathematics. He continues his athletic career as a member of the Bruins Masters Swim Club and the UCLA Club Water Polo Team.