2005年8月，Stephen A. "希德"卡西迪加入了圣安德鲁的体育部, 他已经是水上运动的杰出领袖, 在国内和国际上. He immediately assumed duties as the school’s first Aquatic Director and one year later took over head coaching duties for the Scots scholastic swimming and diving teams. 在他2008年的第三季, 希德带领苏格兰男子队取得了FHSAA历史上的最高排名, 以四项全美最佳球员奖排名第三. 2008年的女子队从33人上升到了33人rd in 2007 to an 11th 拥有一支非常年轻的球队，并着眼于前十. 作为水上运动总监，卡西迪负责监督俱乐部的游泳、跳水和水球队. He has already built his USA Swimming club into a regional powerhouse recognized and placed numerous athletes into top collegiate programs nationwide. Sid has been active in the governance of USA Swimming since 1981 and currently serves on the Board of Directors for Florida Gold Coast Swimming. At the national level he currently serves USA Swimming on the Olympic International Operations Committee and the International Relations Committee.
卡西迪是经由大西洋城来到圣安德鲁的, New Jersey where he spent seven years as that municipality's Aquatic Director and was the founding father of the Atlantic City Aquatic Club. 那是他在那支球队的最后一个夏天, Cassidy's charges won the boys team title at the Middle Atlantic Junior Olympic Championships and finished runner-up in the overall division. His swimmers earned dozens of all-American accolades and notched two national age group records amidst numerous top ten national rankings. 除了精英教练, Cassidy created an outreach program that provided underprivileged youth an opportunity to benefit from the values of USA Swimming that continues to serve to this day.
从1993年到1998年，卡西迪是迈阿密大学男子和女子游泳队和跳水队的主教练. 在此期间，两支队伍都取得了巨大的成功. Cassidy’s men’s teams set a high water mark for UM by capturing a Big East Conference Championship in 1995 and finishing in the top ten at the NCAA Division I Championships four consecutive years. Sid coached one Olympic medalist and dozens of collegiate All-Americans during his tenure with the ‘canes and was named the 1996 Big East Women’s Coach of the Year.
在科勒尔盖布尔斯执教之前, 卡西迪在詹姆斯·麦迪逊大学执教, 佛罗里达州立大学和坦帕大学. 我是詹姆斯·麦迪逊大学的男教练, Sid saw his men win team titles at both the Colonial Athletic Association Championships and the Eastern Collegiate Athletic Conference Championships. 1993年，他被评为ECAC和CAA年度最佳教练. 之前的七季, 卡西迪曾在佛罗里达州立大学担任男子和女子游泳助理教练. During that time, 希德执教了他的第一个全国冠军，并与30多名全美游泳运动员合作过. Cassidy started working with collegiate athletes at the University of Tampa as an assistant coach from 1983 – 1985 while serving as the head coach of the Greater Tampa Swimming Association.
Sid began his coaching career fresh out of college in September of 1979 under the tutelage of his aquatic mentor Bob Mattson at the Wilmington Aquatic Club, his home-town team. 希德成为了一支由400人组成的年龄组球队的主教练，这支球队一直被认为是该地区最好的球队之一. His success at WAC catapulted him to be selected by USA Swimming as the youngest coach to travel internationally with our national team in 1985. 从那时起，希德为美国游泳队效力了其他6个国家队.
作为一名业余游泳运动员，希德在他的高中和大学生涯中取得了巨大的成功. 他曾多次获得特拉华州学生州冠军，并打破了威尔明顿Salesianum学校的记录，并进入了AAU全国决赛. 他是1975年泛美代表队的候补队员，并参加了1976年奥运会的决赛. 北卡罗来纳州立大学, 希德赢得了8个个人会议的冠军，并在两年的时间里保持了200米大西洋海岸会议的记录, 500, 1000码和1650码自由泳项目. He was twice named NCAA Division I All-American and his Wolfpack team dominated the ACC while finishing among the top ten in Division I swimming on a regular basis.
除了他在泳池里的所有资历, 可以说，希德对游泳世界最大的贡献可能是他作为一名游泳运动员的角色, 公开水域游泳教练和管理员. Sid began his own open water swimming career in the mid-70s as a member of the Ocean City Beach Patrol where he enjoyed a four year undefeated streak in the Atlantic Ocean. 他在美国参加过马拉松游泳比赛, 1979年，他在加拿大和埃及的比赛中排名世界第四. 在20世纪80年代，他开始为美国游泳协会服务，担任公开水域游泳的教练和管理员. From 1991 through 1996 Cassidy served as the national team head coach of open water swimming and often led USA’s top competitors on international trips. 在这个职位上，他真正开始获得支持，认为马拉松游泳应该成为奥运会项目. In 1996 USA Swimming asked him to move into a political position as a member of FINA’s Technical Open Water Swimming Committee to further the goal of Olympic inclusion. In 2006 Cassidy was tapped as Chairman of the Committee and his leadership is viewed as instrumental in turning the Olympic Marathon dream into a reality. 2008年北京奥运会, the very first 10,在主席席德·卡西迪的指导下，奥运会的000米马拉松游泳比赛得到了游泳运动员的一致好评, coaches, spectators, 最重要的是媒体, from the IOC.
希德于1992年与前SAS游泳学校主任卡拉·基南(Kara Keenan)结婚. 卡拉和希德有两个孩子, 奎因(13)和凯特(17), 既是圣安德鲁的学生又是水上运动员. 这家人住在博卡拉顿.