Hartin was hired in February 2018 by head coach Katherine Vettori and now enters into his fifth season with the Tigers.

The 2022 season saw the Tigers hit double digit wins for the first time since 2000 and the second most in a single season with 12. The Tigers reached the CAA Tournament for just the second time in program history getting the semifinal round. Towson allowed just 11 goals against thanks to a strong back line and the CAA Goalkeeper of the year Riley Melendez. Melendez was named to the All-CAA First Team, All-Tournament Team and United Soccer Coaches All-East Region Third Team. In total, five players earned All-CAA honors, two were named College Sports Communicators Academic All-District, and three earned United Soccer Coaches All-East Region honors.

Fall 2021 saw Hartin assist Towson in earning its first winning season since 2007, going 8-7-3 overall including three shutout victories over Atlantic-10 programs: George Washington, Saint Joseph's and Temple.  For the second straight season, four players earned All-CAA honors, led by First Team All-CAA and NCAA DI Women's East Region Third Team selection Nia Christopher, the first Tiger to be All-CAA First Team since 2014 and NCAA All-Region since 2013.  The team finished with 27 goals on the season, tied for ninth all-time in program history.

In the 2020-21 academic year, Towson played a spring season due to the COVID-19 pandemic.  The Tigers earned their first-ever program victory over James Madison, also defeating Delaware at home.  Four Tigers, all freshmen, were named All-CAA and All-Rookie: Riley Melendez and Demi Pierre on the All-CAA Second Team plus Nia Christopher and Phoebe Canoles on the All-CAA Third Team.

In 2018, Justine Stoner and Jenna Blank were named to the All-CAA teams while in 2019 Jacey Miller also received the honors.

Hartin also helped spearhead the first ever Women and Girls in Soccer (WAGS) program at Towson. They offered the first-ever all-female referee certification class. 

Prior to his arrival at Towson, Hartin served as the head coach at nearby Division III Notre Dame of Maryland University, beginning in June 2016. Under his guidance, 13 student-athletes earned Fall Colonial States Athletic Conference (CSAC) All-Academic honors. Hartin coached three student-athletes to CSAC All-Conference honors.

Hartin is no stranger to Towson University. During the Spring 2017 semester, he was an adjunct faculty member in the Department of Secondary and Middle Education, teaching a course in Ethics in Education.  His responsibilities included, the development of the syllabus, review and evaluate students’ written work and administered exams.

From August 2015 to June 2016, Hartin was an assistant women’s soccer coach at Division III Stevenson University. Duties included assisting the head coach in the development of practice and game strategies, recruitment and evaluation of potential student-athletes and breaking down statistical data for use in training sessions.

Hartin earned his first collegiate head coaching experience at Montgomery College from August 2012 to August 2015. He worked all facets of the program, including player evaluation, recruiting, training plans, game scheduling, fundraising and budget management. The program was ranked in the Division III National Junior College Athletic Association (NJCAA) Top 10 and reached the Region XX championship game in 2013 and 2014. Additionally, the team was a Region XX semifinalist in 2012. During his tenure, four student-athletes earned All-America honors. Another 15 student-athletes were named NJCAA All-Region XX Division III Team and 12 student-athletes earned All-Maryland Junior College (MDJUCO) plaudits.

In the club game, Hartin has served as a technical trainer and coach for the Towson United Travel Soccer Club from June 2011 through the present.  He served in the same capacity for the Soccer Association of Columbia (SAC) from 2001-2011.  Hartin has also been a staff member at numerous summer camps throughout the region.  

As a collegiate player, Hartin was a member of the program at Division III Lycoming College from 1991-94. During his time in Williamsport, Pennsylvania, Lycoming never suffered a losing record, amassing a 50-24-4 overall record. In his final season, Hartin helped the Warriors reach the Middle Atlantic Conference championship game, finishing the year with a 16-5-0 overall record and a 6-1 mark in the conference.

In addition to a Bachelor of Arts degree in English literature from Lycoming College in 1995, Hartin also earned a Master of Arts in Teaching from nearby Goucher College.