Abdul Baha - traditionally spelled 'Abdu'l-Bahá (1844 - 1921) - was the eldest son and successor of Bahá'u'lláh (1817 - 1892), the Persian nobelman and founder of the Bahá'i faith, known for promoting universal peace. The Bahá'i faith sprang from the Bábism teachings, brought to the people of Persia (now Iran) by The Báb, a young merchant in the early 19th century who believed he was a messenger of God. Abdul Baha was considered the third and final central figure of the Bahá'i religion.
Today, followers of Bahá'i continue to practice and tend to the gardens on Mount Carmel, Israel, where both Bahá'u'llàh and Abdul Baha's remains are interred in a shrine at the garden's center.
It's unclear if Max Pollak met Baha, but he was living in Europe at the time of Baha's death.