He was the New England Cross Country Champion twice, won the Big East Indoor Championship at 5,000 meters three times.
[1] He is the brother of John Treacy, a four-time Irish Olympian, who took second place in the Los Angeles Marathon in 1984, and twice (1977-1978) was the World Cross Country champion.
The 1990 women's team featured Sinead Delahunty, Geraldine Hendricken, and Anita Philpot earning All-American honors to lead the Friars to a second-place finish.
In 2004 New Zealander Smith won the school's first individual NCAA Cross Country title and the team repeated for third.
In 2012 Sarah Collins, Emily Sisson, and Laura Nagel carried Providence to a second-place finish at the NCAA Championships.
Sisson, Nagel and Collins led Providence to its second NCAA XC team title with Treacy being named the USFTCCCA's National Coach of the Year.
[1] Treacy has coached nine Providence runners to individual NCAA track titles in events ranging between 1,500 and 10,000 meters.
Nagel and Shelby Greany earned All-American honors at the 2013 NCAA Outdoor Track and Field Championships.
Sarah Collins posted the second-fastest time ever by a Providence College female runner in the 5,000 meters, running 15:31.03 at the Stanford Invitational.
Both women finished the season at the NCAA Outdoor Track and Field Championships, earning Second-Team All-America honors in the 5,000 meters.
In 2015 Julian Oakley was the eighth Friar under Treacy's tutelage to dip under the sub-four-minute mile mark, with a time of 3:58.89.
In the 2016 Outdoor season, Catarina Rocha won the Big East 5,000 meters and Brianna Ilarda the 3,000-meter Steeplechase.
At the 2008 Beijing Olympics, Smith ran the 10,000 meters, McGettigan the steeplechase and for Ireland, Martin Fagan, the marathon.
[1] Also in Rio, Molly Huddle, a Notre Dame graduate now coached by Treacy, set the U.S. record for the 10,000.
In 2019, Sisson beat her training partner Huddle in the Stanford Invitational 10K, then finished sixth in the 2019 London Marathon, her first try at the distance, with a time of 2:23:08.
Three of the top five women's 10,000 meters finishers at the 2015 USA World Championship Trials, Huddle (1st), Amy Hastings-Cragg (4th), and Sisson (5th), were coached by Treacy.