The International Society for Krishna Consciousness was founded by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada in 1966. It belongs to the Gaudiya Vaisnava tradition, a devotional tradition based on the teachings of Bhagavad-gita and Srimad-Bhagavatam.
The precepts and practices of ISKCON were taught and codified by the 15th century saint and religious reformer Sri Caitanya Mahaprabhu and his principle associates, the Six Goswamis of Vrindavana.
Sri Caitanya, whom devotees revere as a direct incarnation of Krishna, gave a powerful impetus for a massive bhakti (devotional) movement throughout India. Under his direction hundreds of volumes on the philosophy of Krishna consciousness were compiled. Many devotees have followed in the line of Sri Caitanya Mahaprabhu including, in the 19th century, an outstanding Vaisnava theologian, Bhaktivinoda Thakura who brought Krishna consciousness to a modern audience.
Bhaktivinoda's son, Bhaktisiddhanta Sarasvati Goswami, became the guru of Srila Prabhupada and instructed him to spread Krishna consciousness in the West.
Disciplic succession:
The International Society for Krishna Consciousness draws its legitimacy from its place in a long succession of spiritual teachers and disciples (parampara). There are four major disciplic successions (sampradayas), ISKCON belongs to the Brahma Sampradaya, founded by Lord Krishna Himself.
There are many branches to this sampradaya. Our society belongs to the branch founded by Sri Caitanya Mahaprabhu in the 16th century.
The principle is that Vaisnava teachings should be passed on, unchanged, from guru to disciple. The most prominent devotees in this lineage are accepted as acaryas: those who teach by example, who carry the line forward. Listed below are the acaryas s, starting from Lord Krishna Himself all the way down to the Founder Acharya of ISKCON Srila Prabhupada:
1) Krsna,
2) Brahma,
3) Narada;
4) Vyasa,
5) Madhva,
6) Padmanabha,
7) Nrhari,
8) Madhava,
9) Aksobhya,
10) Jaya Tirtha,
11) Jnanasindhu,
12) Dayanidhi,
13) Vidyanidhi,
14) Rajendra,
15) Jayadharma,
16) Purusottama,
17) Brahmanya Tirtha,
18) Vyasa Tirtha,
19) Laksmipati,
20) Madhavendra Puri,
21) Isvara Puri, (Nityananda, Advaita),
22) Lord Caitanya,
23) Rupa, (Svarupa, Sanatana),
24) Raghunatha, Jiva,
25) Krsnadasa,
26) Narottama,
27) Visvanatha,
28) (Baladeva) Jagannatha,
29) Bhaktivinoda,
30) Gaurakisora,
31) Bhaktisiddhanta Sarasvati,
32) His Divine Grace A. C. Bhaktivedanta Swami Prabhupada.
The International Society for Krishna Consciousness (ISKCON) commonly known in the West as the Hare Krishna Movement comes in a tradition that traces all the way back to Lord Krishna Himself. ISKCON was founded in New York in 1966 by His Divine Grace A. C. Bhaktivedanta Swami Prabhupada (1896-1977), referred to as Srila Prabhupada. His spiritual teacher, Bhaktisiddhanta Saraswati Thakura, asked him to teach Bhakti to the English-speaking world.
Links:
[1] http://www.krishna.com/node/663
[2] http://www.krishna.com/node/654