Over the past couple of years, Major League front offices have seen significant turnover.

As February begins, there are seven teams nearing the end of their first offseasons under new leadership, and most have been quite active during that initial run through the Hot Stove. (That group does not include the A's, Braves, Giants, Indians or Reds, each of which has promoted a new general manager from within while elevating their general manager to a more prestigious title. It also leaves out the Marlins, who had president of baseball operations Michael Hill resume GM duties when Dan Jennings was let go.)

Here is a look at what each of those seven front offices has accomplished, starting with the busiest.

Seattle Mariners

The new guy: Executive vice president and general manager Jerry Dipoto

Overview: Nobody has spent more time wheeling and dealing than the former Angels GM, whose acquisitions include starting pitchers Wade Miley and Nathan Karns, first baseman Adam Lind, center fielder Leonys Martin, reliever Joaquin Benoit and catcher Steve Clevenger, who was picked up from Baltimore while the club dumped Mark Trumbo's salary. Dipoto also signed short-term deals with free-agent outfielders Nori Aoki and Franklin Gutierrez, closer Steve Cishek, catcher Chris Iannetta and starter Hisashi Iwakuma, who returned to Seattle after a bigger deal with the Dodgers fell through. A new manager, Scott Servais, also came aboard.

Best move: Acquiring Martin from the Rangers. Seattle had a huge hole in center before buying low on the 27-year-old, who compiled 8.1 WAR from 2013-14.

Most questionable move: Signing Iannetta to a one-year, $4.25 million deal, plus a 2017 club option. The Mariners needed a starting catcher but now will depend on Iannetta bouncing back from a .188/.293/.335 line in his age-33 season.  

Milwaukee Brewers

The new guy: GM David Stearns

Overview: An assistant GM in Houston during the Astros' recent rebuilding phase, Stearns is now trying to pull off something similar in Milwaukee. So far, Stearns has held on to catcher Jonathan Lucroy, but he has dealt veterans Lind (Seattle) and Rodriguez (Detroit) for prospects and over the weekend sent shortstop Jean Segura to Arizona in a five-player swap. The Brewers also have taken sensible, low-risk flyers on players such as first baseman Chris Carter, third baseman Will Middlebrooks and outfielder Rymer Liriano. The full list would be too long to go through.

Best move: Acquiring right-hander Chase Anderson, infielder Aaron Hill and shortstop prospect Isan Diaz from the D-backs. Segura has struggled for a while now and was expendable with top prospect Orlando Arcia coming soon. For the cost of him, pitching prospect Tyler Wagner and part of Hill's 2016 salary, the Brewers landed a solid back-end starter with five years of club control remaining and a high-ceilinged 19-year-old who tore up rookie ball last season.

Most questionable move: None of these transactions carries a significant downside for a team in the Brewers' position.

Detroit Tigers

The new guy: Executive VP of baseball operations & GM Al Avila

Overview: Dave Dombrowski's longtime assistant GM was promoted when Dombrowski was let go in August. Avila's most substantial moves, the big-money signings of starter Jordan Zimmermann and left fielder Justin Upton, have come with a significant push from owner Mike Ilitch. Detroit also added free agent Mike Pelfrey to the rotation and sought to upgrade its bullpen, trading for closer Francisco Rodriguez and lefty Justin Wilson, while signing righty Mark Lowe. Additional acquisitions include outfielder Cameron Maybin, utilityman Mike Aviles and catcher Jarrod Saltalamacchia.

Best move: Signing Upton to a six-year, $132.75 million contract. The Tigers waited out the market and landed a huge left-field upgrade. If the 28-year-old opts out after 2017, Detroit will have paid him only $44.25 million.

Most questionable move: Signing Pelfrey to a two-year, $16 million contact. Left-handed batters posted an .834 OPS against Pelfrey last year, and FanGraphs.com's Steamer projections peg him for a 4.67 ERA in 2016.

Boston Red Sox

The new guys: President of baseball operations Dave Dombrowski

Overview: It didn't take long for Dombrowski to land on his feet after leaving Detroit, and he promoted Mike Hazen from assistant GM to senior VP and GM in September. The Sox haven't made a large number of moves, but they have made big splashes. They lured free agent David Price, dug into their prospect depth to pry closer Craig Kimbrel from San Diego, and gave up Miley in a trade to acquire hard-throwing reliever Carson Smith and lefty Roenis Elias. Boston also signed outfielder Chris Young for two years and exercised Clay Buchholz's 2016 option.

Best move: Signing Price for to a seven-year, $217 million contract. There is plenty of risk involved, but Boston needed an ace, and there's a chance Price could opt out after the 2018 season, before the Sox are paying for his mid-30s.

Most questionable move: Acquiring Kimbrel from the Padres. He certainly figures to help their bullpen, but relievers are risky, he isn't cheap, and Boston gave up two of MLBPipeline.com's top 58 prospects, in Manuel Margot and Javier Guerra.

Toronto Blue Jays

The new guys: Executive VP of baseball operations & GM Ross Atkins, and president & CEO Mark Shapiro

Overview: A couple of months after Shapiro arrived from Cleveland, Alex Anthopoulos resigned, and Tony LaCava stepped in as interim GM. Under his watch, Toronto re-signed starter Marco Estrada to a two-year deal (after extending him a qualifying offer), inked free-agent lefty J.A. Happ for three years and traded reliever Liam Hendriks to Oakland for swingman Jesse Chavez. Atkins was hired away from the Indians on Dec. 4, and the Jays since have swapped outfielder Ben Revere for Washington reliever Drew Storen.

Best move: Acquiring Storen from the Nationals. Picking up club options on Jose Bautista, Edwin Encarnacion and R.A. Dickey was a no-brainer, but Toronto did well to deal from its outfield depth for an arm that fits in the late innings but needed a change of scenery.

Most questionable move: Signing Happ to a three-year, $36 million contract. From 2011-14, including a 58-game stint in Toronto, Happ posted a 4.75 ERA. The Jays are betting he can maintain at least some of last year's late-season breakout in Pittsburgh.

Philadelphia Phillies

The new guys: VP & GM Matt Klentak and president Andy MacPhail

Overview: MacPhail came aboard in the middle of last season and eventually replaced Ruben Amaro Jr. with Klentak, who was the Angels' assistant GM. The rebuilding Phillies are stockpiling young talent, landing a league-high seven prospects on MLBPipeline.com's Top 100 list. The club scored big with last summer's Cole Hamels trade, then again in December when it sent closer Ken Giles to Houston. Philly has dealt for Jeremy Hellickson, Charlie Morton and Brett Oberholtzer to take some pressure off its young starters and made a host of low-risk signings and waiver claims, such as relievers David Hernandez and Edward Mujica, and outfielders Peter Bourjos and David Lough.

Best move: Acquiring Oberholtzer and four pitching prospects, including Mark Appel and Vincent Velasquez from the Astros. By the time the Phillies are contenders, Giles will be expensive and/or declining. Cashing him in with five years of control remaining maximized the return.

Most questionable move: Acquiring Hellickson from the D-backs. Wanting a few veteran arms around is understandable, but it's a bit odd to deal even a low-level prospect for a $7 million pitcher with a 4.86 ERA over the past three seasons.  

Los Angeles Angels

The new guy: GM Billy Eppler

Overview: The former Yankees assistant GM is in a tough spot because owner Arte Moreno wants to stay below the luxury-tax threshold, preventing the signing of Upton or another major free agent. Instead, the Halos have patched up left field by signing Daniel Nava and Craig Gentry, and made other low-cost deals for catcher Geovany Soto, infielder Cliff Pennington and reliever Al Alburquerque. Eppler also traded for a pair of infielders, landing shortstop Andrelton Simmons from Atlanta and third baseman Yunel Escobar from Washington, but surrendering young pitching in the process.

Best move: Acquiring Escobar from the Nationals. The Angels had some bullpen depth and used Trevor Gott to get Escobar, who replaces free agent David Freese. Escobar hit .314/.375/.415 last year and will make a modest $6 million, with an affordable 2017 option.

Most questionable move: Acquiring Simmons from the Braves. He's an outstanding defender and will be paid reasonably over the next five years, but likely won't do much for the Angels' offense. Simmons also cost the Angels' thin farm system lefty Sean Newcomb, MLB's No. 21 prospect.

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Andrew Simon is a Sports on Earth contributor and a reporter for MLB.com. Follow him on Twitter @AndrewSimonMLB.

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