User YoSam. 

YoSam.  posted 24112 waymarks in 713 different categories within 6 countries and 43 regions, of these were 346 posted-first-in-region and also 3 posted-first-in-country.
Unfortunatly the user also has one waymark with a missing region in the database.

In the following list are the categories listed where YoSam. is or was an officer. The star denotes an active officer role, if it is golden then YoSam. is also the current leader of the category.

active	Category	# Approvals
stars	American Civil War Monuments and Memorials	297
stars	Bat Boxes	10
stars	Blue Star Memorial Highway Markers	152
stars	Cemetery Chapels	30
stars	Country Churches	620
stars	Covered Bridges	39
stars	Donated Engraved Bricks and Pavers	259
stars	Graves Mentioning a Cause of Death	56
stars	Historical Society Headquarters	116
stars	Iowa Historical Markers	20
stars	Kansas Historical Markers	33
stars	Legion Posts and Branches	51
stars	Lions Clubs International Markers	164
stars	Maine Historical Markers	62
stars	Mississippi Historical Markers	5
stars	Missouri Historical Markers	224
stars	Motorcycle Sales/Service Sites	38
stars	New Mexico Historical Markers	19
	Non-Specific Veteran Memorials	315
stars	Oklahoma Historical Markers	439
stars	One-Room Schoolhouses	175
stars	Orthodox Churches	99
stars	Outdoor Basketball Courts	370
stars	Philatelic Photographs	420
stars	Pizza Shops - Regional Chains	37
	Police Stations	242
stars	Presbyterian Churches	157
stars	Public Land Survey Marks	102
	Railroad Bridges	101
stars	Retired Prisons	49
stars	Skateparks	170
stars	South Dakota Historical Markers	31
	Specific Veteran Memorials	10
	Spirit of '76	70
stars	Starbucks Stores	15
stars	Takeout / Delivery Menus	40
stars	Texas Historical Markers	4085
stars	U.S. Post Offices	281
	Urban Legends and Superstitions	4
stars	Victorian Style Architecture	360
stars	Wagon Roads and Trails	41
stars	Wagon Wheels	368
stars	War of 1812	374
stars	Waymark Tours (WayTours)	35
stars	West Virginia Historical Markers	91
stars	Wyoming Historical Markers	33