| Jack O'Brien | |
|---|---|
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| Birth name | Marcelo Andreani |
| Born | February 8, 1910[1] Fossola, Carrara, Italy[1] |
| Died | September 24, 1982 (aged 72)[1] Ciudad Juarez, Chihuahua, Mexico[1] |
| Professional wrestling career | |
| Ring name(s) | Jack O'Brien Dr. O'Brian |
| Billed height | 1.73 m (5 ft 8 in)[1] |
| Billed weight | 92 kg (203 lb)[1] |
| Debut | 1934[1] |
| Retired | 1956 |
Marcelo Andreani (February 18, 1910 – September 24, 1982) was a Mexican professional wrestler best known under the ring name "Roughouse" Jack O'Brien and worked mainly in Mexico for Empresa Mexicana de Lucha Libre (EMLL) where he held the Mexican National Lightweight Championship, Mexican National Welterweight Championship and NWA World Welterweight Championship twice during his career that spanned from 1934 until 1956. O'Brien is credited with inventing the Abdominal Stretch, or Tirabuzón (Spanish for "Corkscrew").