Here's the timeline I have so far. Note that he apparently married at least 5 times, I list their names as M, L, A, Donna, and Vicki. Donna died in 1989, Vicki is his widow. For his first 3 marriages he listed himself as white.
10 March, 1942, born, Aliquippa Beaver county (Pittsburgh area) PA. Parents and grandparents all white in all records.
1951, birthday in society news, PA
27 April 1962, News Journal, engagement to M, she in high school, he a graduate of Mt Pleasant Senior High and employed by the Mar-Bet Barber Shop
31 Oct 1963, News Journal, Leonard A Mattern Jr. Pfc in First Marine Division, Hawaii, parents at 2106 Lincoln Ave
6 May 1964, Mrs and Mr Leonard A Mattern Jr have a son May 6, Hawaii
1965 Cpl, Hawaii, in taxi crash with others, Leonard A Mattern, 22
1965 address in Polk's Directory Honolulu: h926 Lunalilo apt 6, Honolulu, Hawaii, occupation US Marine Corps, spouse M
1968 Dec marriage, FL, to L
FBI surveillance on FL Klan activities, Leonard /Buck Mattern included
May 1972 tax issues, assessed for 1971, unpaid balance due
May 1972, divorce from L, Leonard Albert Mattern Jr., Miami
27 May 1973 marriage to A, he listed white, Miami-Dade FL
1976 sued for child support by L
late 1970s, public klan member
March 1980 big Klan fight public, Leonard Mattern referred to as a 14 yr Klan member
3 March charged with concealed weapon, case dismissed 31 Aug 1980
24 June 1980, divorce FL A and Leonard A Mattern Jr
August 1983 Leonard Albert Mattern, Sr died, Kissimmee, Leonard Jr in Kissimmee FL
Fall 1985 Wanzi Cante
Florida Not For Profit Corporation
20 Oct 1985 Leonard A Mattern Jr and D marry, FL, he listed as Indian
1986 more media
Red Nations Sacred Way published
7 July 1987 The Cincinnati Enquirer "As a faculty member of the Institute of Culture and Creation Spirituality in Oakland, Calif., Horse travels throughout the country to conduct Native American rituals."
1988 Snohomish county, WA real estate
24 Nov 1989, wife Donna dies
9 July 1991, Medicine Men for Rent by Avis Little Eagle in Lakota Times, states that Mattern/Ghost Horse is a fraud
5 Oct 1992 changes his name legally to Buck Ghost Horse, Snohomish county, WA
16 Oct 1992 Paul Peter Sahadya legally changes his name to Paul Ghost Horse, Snohomish county WA
1993 included in the "Phony Indians" story by Tim Giago
March 1993, marriage to Vicki Lane Redd, Snohomish county, WA
1994 land purchase Klickitat county, WA
Sungleska Oyata incorporation
2006 Goldendale land put into Buck Ghost Horse and Vicki Ghost Horse Trust of June 2006
05 March 2007 Leonard Albert Mattern Jr/ Buck Ghost Horse dies
2011 mother Maxine Mattern dies, FL
2013 Buck Ghost Horse and Vicki Ghost Horse Trust of June 2006 amended