Born in Milan, Anna Laura Longo graduated in singing and piano from the Conservatory of her native town and of Lecco, studying under the guidance of her parents Silvana Debenedetti and Mino Longo. Following this she proceeded to perfect her studies with Rodolfo Celletti.
At the early age of 15 she made her debut in Rigoletto in Lodi and in 1992 she performed for the first time in Barbiere di Siviglia in Milan. Following this she participated in the 18th Festival della Valle d'Itria in Roméo and Juliette by Gounod, conducted by Giuliano Carella and in Demetrio e Polibio with Carraro, both recorded on CD. In 1993 she sang the part of Oscar in Un Ballo in maschera at the G. Verdi Conservatory in Milan, Nedda in I pagliacci at the Markam Theatre in Toronto, Mimì in La Bohème in Miami with the Broward Fort SO, and Suzel in L'amico Fritz at the Palais du Congres in Juan le Pins.
In 1994 she performed in Martina Franca in La grande Duchesse de Gerolstein (Charlotte) and in Rigoletto at the Teatro Comunale in Cagliari. Between 1994 and 1996 she received her degree in Political Science and won first prize in the International Competion of Rome and second prize at the 'Tito Schipa' competition of Lecco.
1997 brought Anna laura Longo to Jesi, Cairo and Mantua for Verdi's Otello (Desdemona), to the Teatro Politeama Greco in Lecce for a recital and to Milan to perform as Adalgisa in Norma with the Rai Orchestra. In 1998 she made her debut in Le nozze di Figaro at the Teatro dell'Opera in Rome, where she also portrayed the role of Ines in La favorita. She then sang Carmina Burana in Düsseldorf and Essen, took part in three Gala Opera Nights with the Orchestra Philarmonia Hungarica under the baton of Daniel Lipton, as well as recitals in Frankfurt and Nurnberg.
In the 1998/9 season she returned to Jesi to sing in Le nozze di Figaro (Susanna), to Milan for Rossini's Stabat Mater, she sang in a concert at the Puccini Opera Festival in Torre del Lago, and was Berta in Il barbiere di Siviglia at the Teatro dell'Opera in Rome, where she also sang the main role in Gnecco's Prova di un'opera seria.
The 1999/2000 season brought her to Bern and Bari to portray Fiordiligi in Così fan tutte, to Sao Paolo for Rossini's Stabat Mater, to the Teatro Massimo Bellini in Catania to sing as Ninetta in The Love for the Three Oranges and to Trieste for Le nozze di Figaro and Il barbiere di Siviglia.
She has sung in La Bohème (Mimì) at the Festival di Torre del Lago, in Così fan tutte (Fiordiligi) at the Teatro Pergolesi in Jesi and in Ginevra di Scozia (Dalinda) in Teatro Verdi in Trieste, as well as in concerts in Verona (Laudes Evangelis by Bucchi), L'Aquila, Rome (Suite Do-do by Azio Corghi), Lucca and Catania (Donizetti's Requiem).
During the 2001/2002 season, she performed in La rondine (Lisette) in Verona and in La straniera at the Teatro Massimo Bellini in Catania, followed by the interpretations of Donna Anna in Don Giovanni at the Opera Giocosa in Savona and the tour of L'amico Fritz to Livorno, Pisa and Lucca (under the baton of Roberto Tolomelli).
At the Teatro Massimo Bellini in Catania she was Blanche in Les dialogues des Carmélites, under the baton of Arthur Fagen.
Anna Laura Long's future engagements include Prodanà Nevesta (Esmeralda) at the Teatro Verdi in Trieste, La Bohème (Mimì) at the Teatro Filarmonico in Verona, Turandot (Liù) in Torre del Lago and Catania, Gluck's Orfeo ed Euridice at the Teatro di San Carlo in Naples, and I pagliacci at the Teatro Municipale G. Verdi in Salerno.