In 2009, Strong read about an open casting call in an issue of Backstage for a production of Bye Bye Birdie.
Strong slept on the street for hours in a sleeping bag in front of the Roundabout Theatre Company in order to audition, an act that she saw as the start of her professional career.
On May 5, 2009, on the same day Strong's maternal grandmother died in Colombia, came the bittersweet news that Strong was cast in the ensemble, as a member of the chorus and in the role of Helen Miller, one of the friends of the cast's female lead, Kim McAfee.
The show, which starred John Stamos, was produced at the Henry Miller's Theatre in Manhattan, and debuted on October 15 of that year, marking Strong's Broadway debut.
Commented Strong, "I'm making my Broadway debut at the same age Julie Andrews and Liza Minnelli did.
To get my big break so young…is a little frightening, but it assures me that performing is what I was born to do.”
Strong took a six-month break from school in order to focus on rehearsals.
To promote the show, Strong and her castmates performed their rendition of the song “Honestly Sincere” on the morning TV show Good Morning America.

In 2010, during her freshman year at Montclair, Strong was a writer for Backstage magazine's "Take 5" column.
As of 2010, Strong has performed solo for every governor of New Jersey since Christie Todd Whitman, as well as at the White House, and for Colombian President Álvaro Uribe.

On May 27, 2011, Strong sang at the New Jersey Performing Arts Center's Victoria Theater as part of the 2011 NJN Hispanic Youth Showcase, in celebration of the Showcase's 25th anniversary, and in honor of the Showcase's first participants and the memory of music teacher Perla Espinal.
The show was broadcast on NJN on June 29, 2011.

June 2011 saw the debut of Perks, a musical webseries described by Playbill as "Glee meets Wii", in which Strong stars as Courtney, the object of affection for geeky high school gamer Josh (Alex Wyse), the series’ male lead, who is too shy to express his feelings to her.

In August 2011, Strong auditioned for the Broadway musical Mamma Mia!,
on the advice of Bye Bye Birdie's musical director.
A week later she was cast as a temporary replacement for a cast member who had suffered a concussion.
Strong sang all 23 songs in the production, learned multiple dance numbers, and was the understudy for Ali, the supportive best friend of the show's main character, Sophie.

On June 2, 2012, Strong sang the American National Anthem and the Colombian National Anthem at the opening of Union City's Columbia Park, which celebrated the city's Colombian American population, before a crowd that included Union City Mayor Brian P. Stack and the city's Commissioners.

In 2013 Strong was one of 14 applicants selected to attend the week-long Johnny Mercer Foundation Songwriter's Project at Northwestern University in Chicago, a workshop for promising American songwriters.
That July Strong played Captain Jess Hartline in the off-Broadway play Volleygirls, for which Strong and her fellow cast members were given the 2013 NYMF Award for Excellence for Outstanding Ensemble Performance at the New York Musical Theatre Festival.
The following month saw the release of Strong's debut EP album, Rewind, a 12-track record described by Playbill as an "eclectic fusion of Latin, country-folk and piano rock."
In analyzing the title track "Rewind", whose lyrics describe making amends with a lover, Katie Lebert of Gadfly Online stated, "In her revealing chorus 'Can I apologize for what I have realized?',
Strong accurately encapsulates the guilt and indecision we may face near the end of a failing relationship.
A truthful, memorable track, Strong immediately proves that sincerity and emotion."

In November 2013, Strong won Top Female Solo and People's Choice awards at the Hoboken Music Awards.
The following month she performed at Rockwood Music Hall in Manhattan.

On January 12, 2014, she performed at Pianos on Manhattan's Lower East Side.
On August 23 that same year, she performed at the fourth annual Lackawanna Music Festival, a
In 2009, Strong read about an open casting call in an issue of Backstage for a production of Bye Bye Birdie. Strong slept on the street for hours in a sleeping bag in front of the Roundabout Theatre Company in order to audition, an act that she saw as the start of her professional career. On May 5, 2009, on the same day Strong's maternal grandmother died in Colombia, came the bittersweet news that Strong was cast in the ensemble, as a member of the chorus and in the role of Helen Miller, one of the friends of the cast's female lead, Kim McAfee. The show, which starred John Stamos, was produced at the Henry Miller's Theatre in Manhattan, and debuted on October 15 of that year, marking Strong's Broadway debut. Commented Strong, "I'm making my Broadway debut at the same age Julie Andrews and Liza Minnelli did. To get my big break so young…is a little frightening, but it assures me that performing is what I was born to do.” Strong took a six-month break from school in order to focus on rehearsals. To promote the show, Strong and her castmates performed their rendition of the song “Honestly Sincere” on the morning TV show Good Morning America.
In 2010, during her freshman year at Montclair, Strong was a writer for Backstage magazine's "Take 5" column. As of 2010, Strong has performed solo for every governor of New Jersey since Christie Todd Whitman, as well as at the White House, and for Colombian President Álvaro Uribe.
On May 27, 2011, Strong sang at the New Jersey Performing Arts Center's Victoria Theater as part of the 2011 NJN Hispanic Youth Showcase, in celebration of the Showcase's 25th anniversary, and in honor of the Showcase's first participants and the memory of music teacher Perla Espinal. The show was broadcast on NJN on June 29, 2011.
June 2011 saw the debut of Perks, a musical webseries described by Playbill as "Glee meets Wii", in which Strong stars as Courtney, the object of affection for geeky high school gamer Josh (Alex Wyse), the series’ male lead, who is too shy to express his feelings to her.
In August 2011, Strong auditioned for the Broadway musical Mamma Mia!, on the advice of Bye Bye Birdie's musical director. A week later she was cast as a temporary replacement for a cast member who had suffered a concussion. Strong sang all 23 songs in the production, learned multiple dance numbers, and was the understudy for Ali, the supportive best friend of the show's main character, Sophie.
On June 2, 2012, Strong sang the American National Anthem and the Colombian National Anthem at the opening of Union City's Columbia Park, which celebrated the city's Colombian American population, before a crowd that included Union City Mayor Brian P. Stack and the city's Commissioners.
In 2013 Strong was one of 14 applicants selected to attend the week-long Johnny Mercer Foundation Songwriter's Project at Northwestern University in Chicago, a workshop for promising American songwriters. That July Strong played Captain Jess Hartline in the off-Broadway play Volleygirls, for which Strong and her fellow cast members were given the 2013 NYMF Award for Excellence for Outstanding Ensemble Performance at the New York Musical Theatre Festival. The following month saw the release of Strong's debut EP album, Rewind, a 12-track record described by Playbill as an "eclectic fusion of Latin, country-folk and piano rock." In analyzing the title track "Rewind", whose lyrics describe making amends with a lover, Katie Lebert of Gadfly Online stated, "In her revealing chorus 'Can I apologize for what I have realized?', Strong accurately encapsulates the guilt and indecision we may face near the end of a failing relationship. A truthful, memorable track, Strong immediately proves that sincerity and emotion."
In November 2013, Strong won Top Female Solo and People's Choice awards at the Hoboken Music Awards. The following month she performed at Rockwood Music Hall in Manhattan.
On January 12, 2014, she performed at Pianos on Manhattan's Lower East Side. On August 23 that same year, she performed at the fourth annual Lackawanna Music Festival, a
Allison Strong