Just as a starter:

Frank W. Miller, house located at 3330 Minnesota Avenue. He owned a "buffet" called F.W. Miller and Co. which stocked Ron Fernandez Cigars.

Circa 1910, he owned the Kaiserhoff Saloon, located at 1 East Superior. 

He and his wife had a lodge at Bowstring Lake, MN they called "The Elmhurst." 

They were friends with a guy named Freddie Coleman, of Detroit, MI, who played clarinet for the Gollmar Brothers circus band.  (circa 1912) 

He may have been president of the Ashland Brewing Company.

He and his wife were fairly adventurous as a couple. In August 1910 they went on a ten-day canoe trip in "upper St. Louis County" -- probably what is now the BWCA? And in May 1912, he and his wife went on a month-long fishing trip.

In October 1909, they had a party at their lodge at Bowstring Lake, and their houseboat (or party boat, sounds more like) capsized in a storm, and scared the crap out of a bunch of their guests, who had a cold trip back home to Duluth, and probably spoke of the Miller crazy weekend for many whiskies to come. 

The Millers moved to Park Point circa 1910, and lived at 209 S. 17th Avenue East before that. 

Frank's dad and mum came to visit them from New Richmond, Wis., in November 1910, probably to see the new digs. 

In May 1910 there was some dispute between him and some aldermen, and they delayed granting him his saloon license.

And here's one tragic little news item, which leads me to think the Kaiserhoff was not a very fun place, at least for a cat: 

Duluth News-Tribune. Dateline August 10, 1910:

"Smutt," Kaiserhoff Cat, While Despondent, Commits Suicide":

"Smutt," the Kaiserhoff cat, committed suicide yesterday and there was sorrow in the minds of all frequenters of the place last night and many a silent cup was passed to the memory of "Smutt." 

In the front part of the establishment there is a stairway which leads to the basement. Smutt played about the store all the afternoon and then, of a sudden, stopped and in a minute ran to the top of the stairs. 

She then gave a weak "Meow," looked about the place and jumped. She struck halfway down and was found dead at the bottom of the flight with a broken neck.

Here's the listing, for the Miller Hotel and Cafeteria in 1915: 

Miller Hotel: proprietors European Hotel and Cafeteria 224 West Superior

Miller Hotel Co. J W Miller pres and treas; R H Rathbun vice pres; W. A. Miller St. Paul Minn secretary; proprietors Millers Hotel and Cafeteria 714 Torrey Building.