As assistant coach, Marchiano will be responsible for day-to-day operations for training and scouting for the Terrapins. In addition, Marchiano will play a key role in identifying top talents to help boost the recruiting efforts for the Terps.

Marchiano was previously the head coach of the Drexel Dragons men’s soccer team from 2020-22, becoming the first coach since the 1980's to maintain a winning record. In his first season as head coach, Marchiano guided the Dragons to a 6-3-2 record and their first conference tournament appearance in seven seasons. In each of his three seasons in University City, the Dragons as CAA Semi-Finalists. It was the first time in program history that Drexel qualified for three consecutive CAA Tournament appearances, and their first berth since 2013. Marchiano helped Laolu Daranijo and Chris Donovan to become CAA Player of the Year recipients, the program's first and second to ever achieve the award, in addition to 12 All-CAA selections and two All-Region performers. Donovan was selected by the Columbus Crew in the MLS SuperDraft, becoming only the second player in program history to be drafted to the MLS. The Dragons achieved the United Soccer Coaches Team Academic Award in all three seasons and was the 2021 CAA Academic Team Award winner.

Before becoming the head coach at Drexel, Marchiano spent six seasons as an assistant coach at Loyola University Maryland for six seasons under head coach Steve Nichols. While at Loyola (MD), Marchiano was responsible for the day-to-day operations of training, scouting, and recruiting. Over his final four seasons with the Greyhounds, Marchiano helped lead the team to a 27-6-3 record in Patriot League matches. Loyola won or shared three straight regular-season titles from 2017-2019. During that historic stretch, the Greyhounds lost just five league matches over the course of three seasons. The team posted the biggest turnaround in Patriot League history, going from last place in 2015 (0-8-1) to second place in 2016 (6-1-2). In 2018 while an assistant at Loyola (MD), Marchiano was named one of the top assistant coaches in the country by TopDrawerSoccer.

The Greyhounds had a 41-23-7 record over Marchiano's last four seasons after compiling a 7-21-6 mark in his first two years. Loyola had won 10 or more matches in each of the last three seasons, the first time that has happened at the school since 2009, when the Greyhounds were a member of the Metro Atlantic Athletic Conference. Marchiano was also an integral part of the Loyola (MD) recruiting efforts. College Soccer News rated Loyola’s 2020 class as the 13th-best recruiting class in the nation. It was the first time a Loyola recruiting class was ever ranked by the publication. 

Over Marchiano’s final four seasons, 32 players have earned All-Patriot League honors, including 15 first team selections and 12 second team picks. The Greyhounds have had the Patriot League Goalkeeper of the Year and the Midfielder of the Year on three occasions each and have had three of the last four Patriot League Rookies of the Year. He assisted in the development of multiple All-Americans, a Scholar All-American and had two players selected in the 2020 MLS SuperDraft.

Marchiano was an assistant coach for two seasons at Army West Point. In those seasons, Marchiano helped the Black Knights go from a 4-10-3 record in 2012 to a 12-3-3 mark and a second-place finish in 2013, their best season since 1996. Marchiano also spent two seasons as an assistant at Maryland. During those two seasons in College Park, the Terrapins compiled a 34-9-3 and made back-to-back appearances in the NCAA Quarterfinals.

During the Fall of 2023, Marchiano led Loyola Blakefield HS to the first undefeated season in program history while capturing the MIAA Championship and finishing No. 9 nationally per United Soccer Coaches rankings. He was named MIAA and Maryland State Coach of the Year in addition to two players receiving All-American and All-Region status. Marchiano also serves as the Girls ECNL Technical Director for Pipeline Soccer Club.

In his playing days, Marchiano featured in 59 games at Maryland from 2005-08 under head coach Sasho Cirovski. A midfielder, Marchiano's teams were 68-18-8 and won a pair of NCAA Championships in 2005 and 2008. A two-time team captain, he was awarded the team's Peter Lowry Award as a senior, an honor given to the team member who exemplifies academic excellence, leadership and distinguished citizenship on campus.

Marchiano’s wife, Kelley, was also a member of the Terrapins Track & Field team. She holds multiple top-10 marks in program history including the tenth-fastest women’s outdoor 800m time (2:10.09), the sixth-fastest time as a member of the 4x800m relay (8:54.45), and the tenth-fastest time as a member of the Sprint Medley Relay (3:57.19). 

A USSF A licensed coach, Marchiano is a native of Bel Air, Maryland and graduated from the University of Maryland in 2009 with a bachelor’s of arts degree in economics. Michael and Kelley have a daughter, Mila, and a son, Nico.