Lozada became a member of the group in 1980 and was there until 1984. In between, he participated in the album Quiero Ser, which became Menudo's top selling album ever, in the record breaking Brazilian concert that drew 250,000 screaming teens to the stadium, in the big Luis Munoz Marin International Airport welcoming of which the group was an object when they arrived back to Puerto Rico after touring Mexico in 1981, and the movie Una Aventura LLamada Menudo, where he played the boy who fell in love with one of Gladys Rodriguez's daughters in the movie.
Lozada was the romantic one of the group, and his hits with the group included the classic Clara and Senora Mia, a song with a 'son talking to his mom' message that he sang to Ms. Rodriguez in one of the movie's scenes.
He also participated in two soap operas with Menudo in Venezuela.
Johnny came back into the scene participating in Mexican telenovelas, and in 1998, he and former Menudo's Farrait, Miguel Cancel, Ray Reyes, Charlie Masso and Ricky Melendez got together in Puerto Rico for a concert named El Reencuentro. El Reencuentro was so successful that they neded to add two more concerts that weekend and later, they went on tour all over Latin America and the United States
Johnny likes to have contact with his public, and is always accesible for autographs.