Johan Pedersen Born April, 1836.

Hi, I was hoping someone might have some info. on my great, great grandfather's parents please? He was born 29th April, 1836 in either Oslo or a name starting with K and arrived in Australia in 1860, altered his name to John Pearson and was married in 1863. I read a post on him yesterday in this forum, from last year but am unable to find it now. Edited once again as I put in the wrong date. Thank you, Janray.