Was Wilton Marks a Seventh-day Adventist?

Believe or not believe...

Wilton Lamon Marks was baptised a Seventh-day Adventist in India, circa 1946, probably prior to his marriage with my mother! I may even have copies of his baptism certificate.

However, after having lived with him as his son for some twenty years, though he had a strong mystical tendency - probably to compensate for lack of parental affection during his youth - he never was a practising Adventist.

Why the question? And from whom?

Does anyone know where Wilton Marks is now?